Answer Explanations

SAT Practice Test #10
Section 1: Reading Test
QUESTION 1

Choice A is the best answer. Throughout the passage, the narrator
refers to Miss Spivey’s 1938 class as “we” and “us” and describesinteractions between Miss Spivey and her students as a firsthandobserver, indicating that the narrator was a member of this 1938 class.
Therefore, the narrator of the passage can best be described as one ofMiss Spivey’s former students.
Choice B is incorrect because the narrator refers to Miss Spivey’s
predecessor, Miss Chandler, by name, not as “I” or “me,” andtherefore the narrator isn’t Miss Spivey’s predecessor. Choice C isincorrect because the passage identifies the narrator as a member ofMiss Spivey’s 1938 class and also mentions the narrator’s mother andbrother, Ralphord. Choice D is incorrect because the narrator refers toMiss Spivey by name and as “she” and “her,” not as “I” or “me,” andthus can’t be Miss Spivey herself.

QUESTION 2

Choice B is the best answer. The description of the train’s arrival in
the first paragraph suggests that Threestep is a rural town: instead ofa paved platform, the tracks are lined with “burned grass.” Meanwhile,the description of the school in the sixth paragraph implies that thecommunity is small: instead of individual rooms for separate gradelevels, the school’s single room contains twenty-six students spread“across seven grade levels.” Therefore, Threestep is mainly presented
in the passage as a small rural town.
Choice A is incorrect because the narrator describes Threestep
as uncomfortably hot for its residents, not as a summer retreat forvacationers. Choice C is incorrect because Miss Spivey refers toprominent universities located in other cities, not ones located inThreestep. Choice D is incorrect because in the first paragraphThreestep is characterized as a small rural town that is experiencing“hard times,” not as a comfortable suburb.

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QUESTION 3

Choice D is the best answer. In the first paragraph, Miss Spivey
remarks that the heat in Georgia is nothing compared to the heat she
experienced in Timbuktu. Later in this paragraph the narrator states,“I believe her remark irritated some of the people gathered to welcome
her on the burned grass alongside the tracks. When folks are sweating
through their shorts, they don’t like to hear that this is nothingcompared to someplace else.” Hence it can reasonably be inferred fromthe passage that some of the people at the train station regard Miss
Spivey’s comment about the Georgia heat with resentment because
they feel that she is minimizing their discomfort.
Choice A is incorrect because Miss Spivey informs the people at thetrain station that she has experienced even more extreme heat, so theywouldn’t have assumed that she is experiencing intense heat for the
first time. Choice B is incorrect because the passage indicates thatthe people at the station know Miss Spivey is coming to Threestep towork, not that they doubt she will stay there very long. Choice C isincorrect because the passage doesn’t indicate that the people at thetrain station imagine that she is superior to them.

QUESTION 4

Choice B is the best answer. The previous question asks what can beinferred from the passage about the reaction of the people at the train
station to Miss Spivey’s comment about the Georgia heat. The answer,
that it can be reasonably inferred from the passage that some of thepeople at the train station regard Miss Spivey’s comment about theGeorgia heat with resentment because they feel that she’s minimizing
their discomfort, is best supported in the first paragraph: “I believe her
remark irritated some of the people gathered to welcome her on theburned grass alongside the tracks. When folks are sweating throughtheir shorts, they don’t like to hear that this is nothing compared tosomeplace else.”
Choices A, C, and D are incorrect because the cited lines don’t provide
the best evidence for the answer to the previous question. Instead, theydescribe Miss Spivey’s appearance (choice A), reflect on why people
viewed her arrival positively in spite of their irritation over her remark(choice C), and outline her education (choice D).

QUESTION 5

Choice A is the best answer. In the second paragraph, Miss Spivey
describes a break she took from her formal education as a “fruitfulintermission.” She explains that she “traveled extensively in the Near
East and Africa with a friend of her grandmother’s, one Janet Miller”
during this time. Therefore, Miss Spivey most likely uses the phrase“fruitful intermission” to indicate that she benefited from taking time
off from her studies to travel.

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Choice B is incorrect because Miss Spivey’s use of the phrase “fruitfulintermission” doesn’t indicate that her travels with Janet Miller
encouraged her to start medical school. Choice C is incorrect because
Miss Spivey uses the phrase “fruitful intermission” to refer to a breakin her formal education after boarding school, not during her earlyyears there. Choice D is incorrect because Miss Spivey’s use of thephrase “fruitful intermission” doesn’t indicate that this break lasted
longer than she had expected.

QUESTION 6

Choice A is the best answer. In the second paragraph, Miss Spivey
tells her class that she went to Barnard College in New York City,
which prompts Ralphord to ask her what she studied at “Barnyard
College.” In response, Miss Spivey explains that Barnard College “wasthe sister school of Columbia University, of which, she expected, we
all had heard.” This interaction implies that, contrary to Miss Spivey’s
expectations, the names of prestigious East Coast schools aren’t
common knowledge among her pupils. Thus the interaction between
Miss Spivey and Ralphord serves mainly to suggest that Miss Spivey
has an exaggerated view of what information should be considered
common knowledge.
Choice B is incorrect because the interaction between Miss Spivey
and Ralphord establishes an atmosphere of misunderstanding, notfriendliness. Choice C is incorrect because Ralphord’s question
demonstrates his naivety rather than his precociousness. Choice D
is incorrect because the passage doesn’t suggest that Ralphord’squestion is an attempt to amuse Miss Spivey.

QUESTION 7

Choice D is the best answer. The third paragraph describes Miss
Spivey as having “wandered,” or walked aimlessly, into a lecture
by John Dewey. Following her interactions with the professor,
Miss Spivey was inspired to work as an educator; consequently,
she “marched,” or walked purposefully, to sign up for the Teacher’sCollege. Hence, by describing Miss Spivey as having “wandered” inthe former situation and “marched” in the latter, the narrator is most
likely suggesting that Miss Spivey’s initial encounter with Dewey’s
ideas was somewhat accidental but ultimately motivated her todecisive action.
Choices A and C are incorrect because the narrator’s descriptionof Miss Spivey as having “wandered” into Dewey’s class and“marched” to sign up for the Teacher’s College suggests that her
accidental encounter with him motivated her to begin studying to
be a teacher, not that Dewey saw Miss Spivey as lacking confidence
in her ability to teach (choice A) or that she was anxious to be
in charge of her own classroom (choice C). Choice B is incorrect375

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because Miss Spivey didn’t express a desire to teach in the poorest,
most remote corner of America until two years after talking with
Dewey over coffee.

QUESTION 8

Choice C is the best answer. According to the third paragraph, after
two years at the Teacher’s College, Miss Spivey told a woman fromthe WPA that “she wanted to bring democracy and education to thepoorest, darkest, most remote and forgotten corner of America.”
Consequently, “they sent her to Threestep, Georgia,” according to thefourth paragraph. Thus Miss Spivey ended up in Threestep as a direct
result of talking with a woman at the WPA.
Choices A and B are incorrect because Miss Spivey ended up in
Threestep as a direct result of talking with a woman at the WPA,
not as an immediate consequence of her friendship with Janet
Miller (choice A), or her decision to attend college in New York City
(choice B). Choice D is incorrect because Miss Chandler is mentioned
as Miss Spivey’s predecessor in Threestep, but Miss Spivey’s arrival in
town doesn’t occur as a direct result of Miss Chandler’s retirement.

QUESTION 9

Choice C is the best answer. The ninth paragraph describes thestudents’ reaction to Miss Spivey’s announcement that she had seencamels on her trip to Baghdad: “We all hung there for a minute,thinking hard, until Mavis Davis spoke up.” Mavis reminds the otherstudents that camels appear in a story they are familiar with. Thus,
when Miss Spivey announces that she had seen camels, the students’reaction suggests that they are baffled.
Choices A, B, and D are incorrect because when Miss Spivey
announces that she had seen camels, the students’ reaction suggeststhat they are baffled, not delighted (choice A), fascinated (choice B),or worried (choice D).

QUESTION 10

Choice B is the best answer. The previous question asks what thestudents’ reaction suggests about them when Miss Spivey announcesthat she had seen camels. The answer, that their reaction suggests thatthey are baffled, is best supported in the ninth paragraph: “We all hungthere for a minute, thinking hard, until Mavis Davis spoke up.”
Choices A, C, and D are incorrect because the cited lines don’t provide
the best evidence for the answer to the previous question. Instead,they describe Miss Spivey’s anticipation of a delighted or amazedresponse to her announcement that she had seen camels (choice A),376

Answer Explanations | SAT Practice Test #10

relay Mavis’s reference to a story familiar to the students (choice C),
and reflect on the subdued nature of Miss Spivey’s response to Mavis(choice D).

QUESTION 11

Choice D is the best answer. Throughout the passage, the author
contends that efforts to make driving more unpleasant can curtail thenegative environmental effects of car use, such as the rapid growthof “energy-hungry subdivisions.” According to the second paragraph,“one of the few forces with a proven ability to slow the growth ofsuburban sprawl has been the ultimately finite tolerance of commuters
for long, annoying commutes.” Consequently, according to the lastparagraph, “from an environmental perspective, inconvenient travel isa worthy goal.” Thus the main purpose of the passage is to argue that
one way to reduce the negative environmental effects of traffic is tomake driving less agreeable.
Choice A is incorrect because the author introduces the claim thatefforts to reduce traffic actually increase traffic as a supporting point,
not as the main purpose of the passage. Choice B is incorrect because,in the second paragraph, the author does dispute the environmental
value of making car travel more convenient, but this isn’t the main
purpose of the passage. Choice C is incorrect because the negativeenvironmental consequences of car-focused development andsuburban sprawl are supporting details of the passage, not its
main purpose.

QUESTION 12

Choice A is the best answer. In the first paragraph, the author states,“Building good transit isn’t a bad idea, but it can actually backfire
if the new trains and buses merely clear space on highway lanes
for those who would prefer to drive—a group that, historically, has
included almost everyone with access to a car.” In this sentence, theauthor bases his claim about the unintended consequences of building
public transit on the expectation that most people would prefer to drivea car than take trains and buses. Hence this sentence best supports theidea that the author assumes that, all things being equal, people would
rather drive than take mass transit.
Choices B, C, and D are incorrect because the cited lines don’t
provide the best support for the idea that the author assumes that, allthings being equal, people would rather drive than take mass transit.
Instead, they argue that in order to have positive environmental
effects, new transit options have to persuade a substantial number ofpeople not to drive (choice B), contend that unpopular efforts to makedriving less convenient are necessary to reduce driving (choice C),
and connect increased commute times to a reduction in suburban
sprawl (choice D).

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QUESTION 13

Choice A is the best answer. The first paragraph states, “That meansthat a new transit system has to be backed up by something that
impels complementary reductions in car use.” In other words, newpublic transportation initiatives need to be supported, or reinforced, by
policies that reduce car use. Thus “backed up,” as used in the passage,
most nearly means supported.
Choices B, C, and D are incorrect because in the context of thepassage, “backed up” means supported, not copied (choice B),
substituted (choice C), or jammed (choice D).

QUESTION 14

Choice B is the best answer. In the first paragraph, the author
introduces some proposals for reducing car traffic by making driving
slower and less convenient. However, he also acknowledges that“those ideas are not popular.” Thus, in the first paragraph, the author
concedes that his recommendations aren’t widely supported.
Choice A is incorrect because, in the first paragraph, the author doesn’t
indicate that his recommendations are costly to implement. Choice C
is incorrect because the author concedes that his recommendations
are unpopular with the general public, not strongly opposed byexperts. Choice D is incorrect because the author suggests that his
recommendations are environmentally beneficial in the long term, notenvironmentally harmful in the short term.

QUESTION 15

Choice C is the best answer. In the second paragraph, the author
argues that “if, in a misguided effort to do something of environmental
value, municipalities take steps that make long-distance car
commuting faster or more convenient . . . we actually make the sprawl
problem worse.” That is, measures that make driving more convenient
actually harm the environment because they encourage more people tolive in suburban developments, which represents wasteful expansion
in his view. Therefore, based on the passage, the author would most
likely characterize many attempts to improve traffic as well intentioned
but ultimately leading to environmental harm.
Choices A, B, and D are incorrect because the author doesn’tcharacterize attempts to improve traffic as doomed to fail due to drivers’
reluctance to change their behavior (choice A), as overestimating
drivers’ tolerance of long commutes (choice B), or as viable only if they
make driving more economical and productive (choice D).

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QUESTION 16

Choice C is the best answer. The previous question asks how theauthor would most likely characterize many attempts to improve
traffic. The answer, that the author would most likely characterizesuch attempts as well intentioned but ultimately leading toenvironmental harm, is best supported in the second paragraph:“If, in a misguided effort to do something of environmental value,municipalities take steps that make long-distance car commuting fasteror more convenient—by adding lanes, building bypasses, employing
traffic-control measures that make it possible for existing roads toaccommodate more cars with fewer delays, replacing tollbooths withradio-based systems that don’t require drivers even to slow down—weactually make the sprawl problem worse.”
Choices A, B, and D are incorrect because the cited lines don’t provide
the best evidence for the answer to the previous question. Instead,they assert that public transit improvements must be supported bymeasures to reduce car use (choice A), indicate that tolerance for longcommutes has grown recently, but has a natural limit (choice B), andelaborate on why improvements in public transport can fail to decreaseroad use (choice D).

QUESTION 17

Choice D is the best answer. The second paragraph discusses how
efforts to make commuting more convenient can have the unintended
consequence of encouraging people to live farther away from theirjobs: “If you cut commuting time by 10 percent, people who now drive
fifty miles each way to work can justify moving five miles farther out,
because their travel time won’t change.” Therefore, according to
the passage, reducing commuting time for drivers can have theeffect of making drivers more willing to live farther from their placesof employment.
Choices A, B, and C are incorrect because the passage doesn’t suggestthat reducing commuting time can make drivers more productive
employees (choice A), can cause mass transit to be extended farther
into suburban areas (choice B), or can result in less government
funding for mass transit (choice C).

QUESTION 18

Choice C is the best answer. The last paragraph asserts, “No one everpromotes a transit scheme by arguing that it would make traveling lessconvenient.” In other words, nobody advocates, or pushes for, changes
to the transportation system by arguing that they would make travelingless convenient. Thus “promotes,” as used in the passage, most nearlymeans advocates.

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Choices A, B, and D are incorrect because in the context of thepassage, “promotes” means advocates, not upgrades (choice A), serves(choice B), or develops (choice D).

QUESTION 19

Choice B is the best answer. Figure 1 presents data related to theeffect of route capacity reduction on selected regions. In the row
pertaining to Southampton city center, the number 5,316 appears
under the heading “Vehicles per day on altered road” in the columnthat specifies “Before alteration.” Thus, according to figure 1,
the number of vehicles that traveled on the altered road throughSouthampton city center per day before the route was altered is 5,316.
Choice A is incorrect because 3,081 is the number of vehicles per day
that traveled on the Southampton city center road after it was altered,
not before. Choice C is incorrect because 24,101 is the number ofvehicles per day that traveled on roads surrounding the Southampton
city center road after it was altered. Choice D is incorrect because
26,522 is the number of vehicles that traveled on roads surrounding theSouthampton city center road before it was altered.

QUESTION 20

Choice B is the best answer. In the first paragraph, the author of thepassage argues that “to have environmental value . . . a new transit
system has to be backed up by something that impels complementary
reductions in car use—say, the physical elimination of traffic lanes.”
According to figure 1, reducing route capacity resulted in a net
reduction in regional traffic in all five areas studied. Therefore, the datain figure 1 support the author’s argument because the data show that
reducing road capacity can lead to a net reduction in traffic.
Choice A is incorrect. Figure 1 data support the author’s argument thatroute capacity reduction results in a reduction of car use, but the figure
doesn’t provide data relating to the “induced traffic” phenomenon.
Choices C and D are incorrect because figure 1 data support, notweaken, the author’s argument that route capacity reduction such as
elimination of traffic lanes results in reduction of traffic.

QUESTION 21

Choice D is the best answer. Figure 2 presents data related to an
opinion poll of transportation engineers. According to the y-axislabel, the engineers were asked whether a significant road space
reallocation could result in people changing various aspects of theirdriving. The graph shows four different answer possibilities: “yes,”“yes (in exceptional circumstances),” “no,” and “don’t know.” Thequestion asks for the aspect of driver behavior that the engineers
surveyed thought was least likely to change in the event of areallocation of road space according to figure 2: when they travel,

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their means of traveling, how often they make a journey, or theirdriving style. Of these four choices, “their driving style,” received thesmallest percentage of “yes” and “yes (in exceptional circumstances)”
responses and the largest percentage of “no” responses. Hence, basedon figure 2, the engineers surveyed were most skeptical of the idea
that, in the event of a reallocation of road space, drivers would change
their driving style.
Choices A, B, and C are incorrect because, according to figure 2,
when the engineers were asked whether they thought that drivers
would change when they travel (choice A), their means of traveling(choice B), or how often they make a journey (choice C) in the eventof a significant road space reallocation, they gave more “yes” or “yes(in exceptional circumstances)” answers, and fewer “no” answers
than they gave in response to the question of whether they thought
drivers would change their driving style. Thus the engineers were lessskeptical of these potential changes than they were of the idea thatdrivers would change their driving style in the event of a significant
road space reallocation.

QUESTION 22

Choice D is the best answer. The first paragraph asserts that textbook
authors in the early 1990s believed that “sensations of pressure andvibration . . . travel only along myelinated, fast-signaling nerve fibers.”
Thus, based on the passage, textbook authors in the early 1990s would
most likely have expected that the ability to perceive vibrations would
be impaired as a result of blocking fast fibers.
Choices A, B, and C are incorrect because the passage indicates thattextbook authors in the early 1990s believed blocking fast nerve fibers
would impair sensations of vibration, not that blocking would increase
the firing rate of other fibers (choice A), cause gentle stimuli to beperceived as painful (choice B), or make the body compensate by using
slow fibers to sense pressure (choice C).

QUESTION 23

Choice B is the best answer. The previous question asks what
condition textbook authors in the early 1990s would most likely haveexpected to result from blocking fast fibers. The answer, that theywould most likely have expected blocking fast fibers to result in an
impairment of the ability to perceive vibrations, is best supported in
the first paragraph, which refers to the views of textbook authors in
the early 1990s: “Sensations of pressure and vibration were believed
to travel only along myelinated, fast-signaling nerve fibers, which also
give information about location.”
Choices A, C, and D are incorrect because the cited lines don’t
provide the best evidence for the answer to the previous question.
Instead, they assert that textbook authors in the early 1990s believed

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slow-conducting nerves responded only to pain and temperature
stimuli (choice A), noted that blocking slow fibers only seemed toreduce sensitivity to warmth or small painful shocks (choice C), andknew that fast-conducting fibers responded to touch at a signal rate of
35 to 75 m/s (choice D).

QUESTION 24

Choice A is the best answer. The second paragraph states, “Håkan
Olausson and his Gothenburg University colleagues Åke Vallbo andJohan Wessberg wondered if slow fibers responsive to gentle pressure
might be active in humans as well as in other mammals.” In otherwords, the researchers wondered if these nerves were present, or
existent, in humans and other mammals. Therefore, in the context ofthe passage, the word “active” most nearly means present.
Choices B, C, and D are incorrect because in the context of thepassage, “active” most nearly means present, not attentive (choice B),
movable (choice C), or restless (choice D).

QUESTION 25

Choice C is the best answer. The second paragraph states, “Using atechnique called microneurography, in which a fine filament is inserted
into a single nerve to capture its electrical impulses, the scientists wereable to measure how quickly—or slowly—the nerves fired.” In otherwords, the researchers used the technique known as microneurography
to record, or register, the electrical signals sent by nerve fibers.
Therefore, in the context of the passage, the word “capture” mostnearly means record.
Choices A, B, and D are incorrect because in the context of thepassage, “capture” most nearly means record, not occupy (choice A),
seize (choice B), or influence (choice D).

QUESTION 26

Choice C is the best answer. According to the passage, different typesof nerve fibers carry signals at different speeds, either fast or slow.
The second paragraph outlines a study led by Håkan Olausson in 1993
that measured the response time of nerves when exposed to gentle
pressure. Olausson and his team found that “soft stroking prompted
two different signals” in test subjects’ nerve fibers, “one immediateand one delayed.” Therefore, the conclusion that is best supported by
the findings of Olausson’s 1993 experiment is that gentle pressure issensed not only by fast fibers but also by slow fibers.
Choices A and D are incorrect because according to the passage,
Olausson’s 1993 study didn’t compare how signal speed was affectedby stimulation in different bodily areas (choice A) or by different382

Answer Explanations | SAT Practice Test #10

amounts of pressure applied to the nerve (choice D). Choice B isincorrect because the passage notes that only human hairy skincontains slow nerve fibers, not that hair causes signal speeds to slow.

QUESTION 27

Choice B is the best answer. The previous question asks whichconclusion is best supported by the findings of Olausson’s 1993
experiment. The answer, that Olausson’s 1993 experiment best
supports the conclusion that gentle pressure is sensed not only by
fast fibers but also by slow fibers, is best supported in the second
paragraph: Olausson’s team “showed that soft stroking prompted two
different signals, one immediate and one delayed.”
Choices A, C, and D are incorrect because the cited lines don’t provide
the best evidence for the answer to the previous question. Instead,they describe a technique used by Olausson’s team (choice A), quantify
the amount of time between the fast signals and the slow signals
observed by Olausson’s team (choice C), and introduce a further study
conducted by Olausson’s team in 1999 (choice D).

QUESTION 28

Choice D is the best answer. This sentence from the fourth paragraphoutlines a quandary that arose from the 1999 study conducted by
Olausson’s team: “But why exactly humans might have such fibers,
which respond only to a narrow range of rather subtle stimuli, wasinitially mystifying.” The passage presents this line of inquiry as ajustification for the team’s subsequent research on CT fibers. Thus
this sentence serves mainly to show a problem from the perspective of
Olausson’s team.
Choices A, B, and C are incorrect. The cited lines serve mainly
to show a problem from the perspective of Olausson’s team, notto identify factors Olausson had previously failed to consider(choice A), propose a solution to a dilemma encountered by Olausson(choice B), or anticipate a potential criticism of Olausson by thereader (choice C).

QUESTION 29

Choice A is the best answer. According to the fifth paragraph,
Olausson set out to discover, in his team’s 1999 research, whether a CT
nerve “can distinguish where the brush touches the arm, and whether
it can discern the difference between a goat-hair brush and a feather.
Most importantly, could that same fiber convey a pleasant sensation?”
Therefore, it can reasonably be inferred that one of the intended
goals of the 1999 experiment was to determine the precise nature ofsensations that CT fibers can convey.

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Choices B, C, and D are incorrect because in their 1999 research,
Olausson’s team didn’t seek to determine the relationship between
human body hair and CT fiber function (choice B), the role playedby CT fibers in the perception of pain (choice C), or the effects of
microneurography on CT fiber signaling (choice D).

QUESTION 30

Choice D is the best answer. In the 1999 study, Olausson’s teamconducted experiments on a patient known as G.L. The researchers
wanted to learn more about what type of sensations slow-conducting
CT nerve fibers transmit, and G.L. was of special interest to them,according to the sixth paragraph: “More than 2 decades earlier . . . she
had lost responsiveness to pressure, and a nerve biopsy confirmed that
G.L.’s quick-conducting fibers were gone. . . . But she could still sense
warmth, suggesting that her slow-conducting unmyelinated fibers
were intact.” The fact that G.L.’s slow-conducting fibers were stillintact while her other nerves were unresponsive allowed Olausson’s
team to study her slow-conducting CT fibers in isolation. Thus themain purpose of the sixth paragraph is to indicate why G.L.’s medical
condition was of value to Olausson’s experiment.
Choices A, B, and C are incorrect because the sixth paragraph doesn’t
indicate that Olausson’s team set out to relieve any of the neurologicalconditions that G.L. exhibited (choice A), compare G.L.’s nerve
function with that of other adults (choice B), or detail any proceduresthat G.L. had experienced during previous experiments (choice C).

QUESTION 31

Choice A is the best answer. According to the last paragraph,“in normal subjects, both the somatosensory and insular cortices
were activated [by gentle brushing], but only the insular cortex[which processes emotion] was active when researchers brushed
G.L.’s arm.” Therefore, according to the passage, G.L. differed from
Olausson’s other test subjects in terms of the number of cortices
activated in the brain during gentle brushing.
Choice B is incorrect because the passage doesn’t address the physicaldimensions of the somatosensory cortex in G.L. or other test subjects.
Choice C is incorrect because G.L. differed from other test subjects interms of the number of cortices activated in the brain during gentle
brushing, not in terms of the intensity of nerve signals required
to activate the insular cortex. Choice D is incorrect because MRI
scanning is discussed in the passage as a method used to locate brain
activity, not as a focus of study in Olausson’s research.

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QUESTION 32

Choice B is the best answer. According to the last paragraph,
Olausson’s 1999 research, in which CT fibers were stimulated,“solidified the notion that CT fibers convey a more emotional quality oftouch.” Hence humans experience an emotional aspect of touch when
CT fibers are exposed to a stimulus, according to the passage.
Choice A is incorrect because the passage doesn’t indicate thathumans experience an emotional aspect of touch when brain cortices
are shielded from nerve signals. Choice C is incorrect because thesuppression of G.L.’s pain-sensing fibers did help Olausson study
CT fibers in isolation and determine that they transmit an emotional
aspect of touch, but the passage doesn’t suggest that suppressingthese fibers is what allows humans to experience this emotional aspectof touch. Choice D is incorrect because the passage indicates thatCT fibers transmit an emotional aspect of touch rather than conscious
aspects of sensation, not that humans must ignore the conscious
aspects of sensation in order to experience the emotional aspectsof touch.

QUESTION 33

Choice C is the best answer. In the first paragraph of Passage 1,
Beveridge portrays America as “a noble land that God has given us;a land that can feed and clothe the world; a land whose coast lines
would enclose half the countries of Europe.” Thus, in Passage 1,
Beveridge asserts that the resources and immensity of the UnitedStates constitute a divine gift to the American people.
Choice A is incorrect because Beveridge envisions Americans
occupying foreign lands, not being subject to foreign invasion;
moreover, he asserts that the resources and immensity of the UnitedStates constitute a divine gift, not a safeguard against invasion.
Choice B is incorrect because Beveridge asserts that American society
constitutes an improvement on English society, not that the resources
and immensity of the United States replicate conditions in Europe.
Choice D is incorrect because Beveridge doesn’t assert that theresources and immensity of the United States constitute a source ofenvy for people in other countries.

QUESTION 34

Choice B is the best answer. In the second paragraph of Passage 1,
Beveridge commands his audience several times to think of a futurein which American laws and customs have been extended to foreigncountries, leading American citizens to move to those places.
According to Beveridge, this will provide Hawaii and Puerto Ricowith “justice and safety,” the Philippines with “order and equity,” andCuba with a “civilization of energy and industry.” Thus, in the second
paragraph of Passage 1, the commands given by Beveridge mainly
serve to anticipate the benefits of a proposed policy.
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Choices A, C, and D are incorrect because Beveridge’s commands
serve to anticipate the benefits of a proposed foreign policy, not toremind the audience of its civic responsibilities (choice A), emphasize
the urgency of a national problem (choice C), or refute an argument
advanced by opponents (choice D).

QUESTION 35

Choice B is the best answer. The fourth paragraph of Passage 2
asserts that “a truth once spoken can never be recalled. It goes on andon, and no one can set a limit to its ever-widening influence.” In otherwords, when a true idea has been introduced to the world, it can neverbe retracted, or taken back. Therefore, in the context of the passage,
the word “recalled” most nearly means retracted.
Choices A, C, and D are incorrect because in the context of thepassage, “recalled” most nearly means retracted, not repeated(choice A), rejected (choice C), or remembered (choice D).

QUESTION 36

Choice D is the best answer. In the fourth paragraph of Passage 2,
Bryan argues that the principle of self-rule set forth in the Declarationof Independence is, in fact, a value that all people instinctively aspire
to. Indeed, for Bryan, “[God] never made a race of people so low inthe scale of civilization or intelligence that it would welcome a foreign
master.” Therefore, it can reasonably be inferred from Passage 2that Bryan considers the preference for national sovereignty overforeign rule to be a manifestation of an innate drive in humans
toward self-rule.
Choices A and C are incorrect because it can reasonably be inferredthat Bryan considers the preference for national sovereignty
over foreign rule to be a manifestation of a universal drive inhumans that’s independent of circumstances, not a reaction to theexcesses of imperial governments in the modern era (choice A) ora testament to the effects of the foreign policy of the United States(choice C). Choice B is incorrect because Bryan indicates that apreference for self-rule is universal, not that belief in human equality
is widespread.

QUESTION 37

Choice C is the best answer. The previous question asks what canreasonably be inferred from Passage 2 about Bryan’s views on thepreference for national sovereignty over foreign rule. The answer,
that Bryan considers the preference to be a manifestation of an innate
drive in humans toward self-rule, is best supported in the fourthparagraph of Passage 2: “[God] never made a race of people so low
in the scale of civilization or intelligence that it would welcome aforeign master.”386

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Choices A, B, and D are incorrect because the cited lines don’t provide
the best evidence for the answer to the previous question. Instead,they indicate that explicitly promoting imperialism would run counterto the words of American founding father Patrick Henry (choice A),
assert that once a truth is uttered, its influence will continually grow(choice B), and introduce the notion that, in Bryan’s view, an imperial
project in the Philippines would hurt not only the people of that nation
but also the people of the United States (choice D).

QUESTION 38

Choice A is the best answer. The last paragraph of Passage 2 states,“Those who would have this Nation enter upon a career of empire
must consider, not only the effect of imperialism on the Filipinos, butthey must also calculate its effects upon our own nation.” In otherwords, proponents of imperial conquest must evaluate, or assess,the consequences of this policy for the United States. Therefore,
in the context of the passage, the word “calculate” most nearlymeans evaluate.
Choices B, C, and D are incorrect because in the context of thepassage, “calculate” most nearly means evaluate, not design(choice B), assume (choice C), or multiply (choice D).

QUESTION 39

Choice A is the best answer. In the first paragraph of Passage 1,
Beveridge references the founding and history of the United States as“a glorious history” that was bestowed upon God’s “chosen people,”a history heroic with faith in its mission and future, and “statesmen,
who flung the boundaries of the Republic out into unexplored lands.”
Similarly, in the second paragraph of Passage 2, Bryan declares, “Ourwhole history has been an encouragement . . . to all who are denied avoice in their own government.” Bryan goes on to extol the virtues ofseveral figures who were instrumental in the founding of the UnitedStates, including Thomas Jefferson and George Washington. Hence,
in developing their respective arguments, Beveridge (Passage 1)
and Bryan (Passage 2) both express admiration for the founding andhistory of the United States.
Choice B is incorrect because neither Bryan, in Passage 1, nor
Beveridge, in Passage 2, expresses admiration for the vibrancy anddiversity of American culture. Choice C is incorrect because Bryan
expresses admiration for the worldwide history of struggles forindependence, but Beveridge doesn’t. Choice D is incorrect because
Beveridge expresses admiration for the idealism that permeates many
aspects of American society, but Bryan doesn’t.

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QUESTION 40

Choice B is the best answer. In the first paragraph of Passage 1,
Beveridge argues that Americans are “imperial by virtue of theirpower” and are therefore justified in being “the propagandists . . . ofliberty.” In the second paragraph, he extols the benefits that will arise
from American administration of various island nations. Meanwhile, inthe last sentence of Passage 2, Bryan cautions, “We cannot repudiate
the principle of self-government in the Philippines without weakeningthat principle here”; in other words, imperial expansion by the UnitedStates would erode a key American value. Therefore, the difference
between how the speakers view liberty as it is realized in the UnitedStates is that Beveridge considers it so exemplary as to justify theconquest of other regions, whereas Bryan warns that its exemplary
quality would be undermined by imperial expansion.
Choice A is incorrect because Beveridge doesn’t present the conceptof liberty as it’s realized in the United States as the direct inheritanceof European colonization. Choice C is incorrect because Beveridge
doesn’t argue that the concept of liberty as it’s realized in the UnitedStates arose organically as the country matured; instead, both
Beveridge and Bryan emphasize the divinely inspired, intrinsic natureof the American concept of liberty. Choice D is incorrect because
Bryan views the concept of liberty as it’s realized in the United Statesas encompassing a desire for self-rule and argues that this desire isuniversal and not unique to the United States.

QUESTION 41

Choice D is the best answer. In Passage 1, Beveridge advocates for
American administration of island nations, such as the Philippines.
However, in the first paragraph of Passage 2, Bryan warns, “If it isright for the United States to hold the Philippine Islands permanently
and imitate European empires in the government of colonies, theRepublican party . . . must expect the subject races to protest against
such a policy and to resist to the extent of their ability.” Thus it canmost reasonably be inferred from Passage 2 that Bryan would criticize
the vision of American governance of island territories that Beveridge
presents in Passage 1 for being naive, since the islanders would object
to being governed by Americans.
Choices A, B, and C are incorrect because, in Passage 2, Bryan
doesn’t imply that Beveridge’s vision of American governance ofisland territories is unrealistic due to most Americans’ unwillingness
to relocate to distant islands (choice A), deceptive due to the factthat economic domination would be the true goal of the American
government (choice B), or impractical due to the islanders’ insistence
upon an equal distribution of resources (choice C).

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QUESTION 42

Choice A is the best answer. The previous question asks whatcriticism Bryan would most likely make of Beveridge’s vision ofAmerican governance of island territories. The answer, that Bryan
would criticize this vision for being naive, since islanders would
object to being governed by Americans, is best supported by the firstparagraph of Passage 2: “If it is right for the United States to holdthe Philippine Islands permanently and imitate European empires in
the government of colonies, the Republican party ought to state its
position and defend it, but it must expect the subject races to protest
against such a policy and to resist to the extent of their ability.”
Choices B, C, and D are incorrect because the cited lines don’t provide
the best evidence for the answer to the previous question. Instead, theyassert that the people of the Philippines don’t need encouragementfrom Americans to resist imperialism (choice B), state that American
history encourages resistance to imperialism by all people, including
the people of the Philippines (choice C), and note the enduringresonance of Patrick Henry’s famous quote about liberty (choice D).

QUESTION 43

Choice A is the best answer. The passage summarizes research on
the relationship between plowing and weed growth. According to thefourth paragraph, the research of Karl Hartmann suggests that plowing
fields during the day leads to weed growth because exposure to evensmall amounts of light can “induce seed germination,” or cause seeds
to sprout. Thus, according to the passage, exposure to light allows
seeds to begin to develop.
Choices B and D are incorrect because the passage indicates that
small amounts of light cause seeds to sprout, but it doesn’t explicitly
assert that light exposure allows seeds to absorb necessary nutrients(choice B) and doesn’t discuss whether light exposure helps seeds
achieve maximum growth (choice D). Choice C is incorrect because thepassage doesn’t indicate that light exposure can help seeds withstandextreme temperatures.

QUESTION 44

Choice B is the best answer. In the second paragraph of the passage,
the following question is posed: “Do the blades of a plow, which canreach more than a foot beneath the soil surface, bring some of theseburied seeds to the surface where their germination is induced byexposure to sunlight?” The passage goes on to describe research
conducted both in the laboratory and in the field that sought toanswer this question. Hence the question in the second paragraphprimarily serves to introduce the specific research topic addressed in
the passage.

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Choice A is incorrect because the question in the second paragraphdoesn’t primarily serve to emphasize the provisional nature of thefindings discussed in the passage. Sauer and Struik’s 1960s lab
experiments, described in the third paragraph, produced findingsthat could be characterized as provisional; however, Karl Hartmann’s
research described in the fourth paragraph clearly demonstrated
that plowing at night can be an effective way to reduce weed growth.
Choice C is incorrect because the impact of the studies analyzed in
the passage has been real and practical, not hypothetical. Choice D
is incorrect because the question in the second paragraph doesn’t
indicate that there is any significant disagreement about the methods
explored in the passage.

QUESTION 45

Choice D is the best answer. The last sentence of the second
paragraph asks, “Do the blades of a plow . . . bring some of theseburied seeds to the surface where their germination is induced byexposure to sunlight?” In other words, does some farm equipment
bring buried seeds to the surface where their sprouting is stimulated,or activated, by exposure to sunlight? Therefore, in the context of thepassage, the word “induced” most nearly means stimulated.
Choices A, B, and C are incorrect because in the context of thepassage, “induced” most nearly means stimulated, not lured(choice A), established (choice B), or convinced (choice C).

QUESTION 46

Choice C is the best answer. The question asks which selection
from the passage best supports the idea that seeds present in fields
plowed at night are exposed to some amount of light. The fourthparagraph asserts that plowing at night can reduce the germinationof weed seeds. The paragraph concludes that “although even underthese conditions hundreds of millions of photons strike each square
millimeter of ground each second, this illumination is below thethreshold needed to stimulate the germination of most seeds.” Thus
this sentence best supports the idea that seeds present in fields plowedat night are exposed to some amount of light.
Choices A, B, and D are incorrect because the cited lines don’t provide
the best support for the idea that seeds present in fields plowedat night are exposed to some amount of light. Instead, they relay
Hartmann’s initial reasoning about seed exposure to light in fields
plowed during the day (choice A), affirm that even minute durationsof sunlight exposure can induce seed germination (choice B), andexplain Hartmann’s initial skepticism regarding his own idea about theeffectiveness of nighttime plowing as a weed deterrent (choice D).

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QUESTION 47

Choice A is the best answer. The sixth paragraph describes anexperiment conducted by Karl Hartmann with the help of farmer
Karl Seydel. Seydel plowed one strip of land during the day and theother at night to see what effect this had on weed growth. However,“no crops were planted in these pilot experiments, to avoid possible
competition with the emerging weeds.” Thus the passage suggeststhat if Seydel had planted wheat or corn on the two agricultural strips
in Hartmann’s experiment, the percentage of the surface of each strip
covered with weeds would likely have been lower than the percentagethat Hartmann found.
Choice B is incorrect. If Seydel had planted wheat or corn crops on
the two agricultural strips, the percentage of weeds wouldn’t havebeen higher than the percentage predicted because competition withthe crops would have prevented some weed growth. Choice C isincorrect because a reduction in weed growth would have been easily
observable, not nearly impossible for Hartmann to determine. Choice D
is incorrect. Hartmann’s original projection was that plowing at night
wouldn't provide more effective weed control. Therefore, the dramatic
drop in the percentage of weeds covering the strip plowed at night
wouldn’t have been comparable with Hartmann’s original projection,
regardless of whether crops were planted.

QUESTION 48

Choice B is the best answer. The previous question asks what thepassage suggests about the percentage of surface that would havebeen covered with weeds if Seydel had planted wheat or corn on the
two agricultural strips in Hartmann’s experiment. The answer, thatthe percentage of surface with weeds would have been lower than thepercentage Hartmann found, is best supported in the sixth paragraph:“No crops were planted in these pilot experiments, to avoid possible
competition with the emerging weeds.”
Choices A, C, and D are incorrect because the cited lines don’t provide
the best evidence for the answer to the previous question. Instead,they describe the conditions of Hartmann’s experiment (choice A),
characterize the results of the experiment as dramatic (choice C), andreport the results of the experiment (choice D).

QUESTION 49

Choice C is the best answer. The sixth paragraph states, in reference
to Hartmann’s experiment, “The results were dramatic. More than
80 percent of the surface of the field plowed in daylight was covered byweeds, whereas only about 2 percent of the field plowed at night wascovered by weeds.” In other words, the outcome of the experiment was
impressive, or striking. Therefore, in the context of the passage, theword “dramatic” most nearly means impressive.

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Choices A, B, and D are incorrect because, in the context of thepassage, “dramatic” most nearly means impressive, not theatrical(choice A), sudden (choice B), or emotional (choice D).

QUESTION 50

Choice A is the best answer. According to the table, 0 weed seedlings
emerged in sample A when the soil was disturbed in darkness. This is
the lowest number of seedlings recorded among all the samples in thetable when the soil was disturbed in darkness.
Choices B, C, and D are incorrect because sample B (choice B),
sample C (choice C), and sample D (choice D) had 1, 2, and 3 seedlings
emerge, respectively, when the soil was disturbed in darkness. These
totals are all greater than 0, the number of seedlings that emerged fromsample A when the soil was disturbed in darkness.

QUESTION 51

Choice C is the best answer. According to the table, 14 weed seedlings
emerged in sample I when the soil was disturbed in light. This is thehighest number of seedlings recorded among all the samples in thetable when the soil was disturbed in light.
Choices A, B, and D are incorrect because sample G (choice A),
sample H (choice B), and sample J (choice D) had 0, 2, and 5 seedlings
emerge, respectively, when the soil was disturbed in light. This is lessthan the 14 seedlings that emerged from sample I when the soil was
disturbed in light.

QUESTION 52

Choice D is the best answer. The data presented in the table showthat in nine of the ten soil samples studied, fewer weeds grew in thesoil when it was disturbed in darkness than when it was disturbed
in light. The fourth paragraph relays Karl Hartmann’s hypothesis
based on Sauer and Struik’s studies of weed growth in the 1960s:“Thus the germination of weed seeds would be minimized if farmers
simply plowed their fields during the night, when the photon fluence
rate [the rate at which photons hit the surface] is below 1015 photons
per square meter per second.” Therefore, the data presented in thetable most directly support the claim made in the fourth paragraph ofthe passage.
Choices A, B, and C are incorrect because the cited lines aren’t directly
supported by the data presented in the table. While the findings in thetable report on weed growth in soil stirred up during the day and night,
these lines discuss the prehistoric use of plowing to control weeds(choice A), the number of weed seeds buried beneath the soil surface(choice B), and the depth at which seeds are buried that prevents themfrom germinating (choice C).

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Answer Explanations | SAT Practice Test #10

Section 2: writing and language Test
QUESTION 1

Choice A is the best answer. The conjunction “and” appropriately
separates the last two nouns in the series, “radio” and “other media.”
Choices B, C, and D are incorrect because “and with,” “and also,”and “and competing with” disrupt the parallel structure of the seriesof three nouns (“television,” “radio,” “[other] media”) introduced by“competing with.”

QUESTION 2

Choice D is the best answer. The topic of the passage is the creationof The Cat in the Hat as a means of getting children more interested
in learning to read. Hersey’s suggestion that one way of making
children’s books more interesting was to use “drawings like those of
the wonderfully imaginative geniuses among children’s illustrators”
best supports the topic of the passage.
Choices A, B, and C are incorrect because they don’t support the
topic of the passage. A sense of wholeness and accomplishment, thevalue of failure, and a difference between journalism and fiction don’t
support the idea of making children’s literature more interesting.

QUESTION 3

Choice A is the best answer. The comma after “Spaulding” is paired
correctly with the comma after “Mifflin” to set off grammaticallynonessential information.
Choice B is incorrect because a comma is needed after “Spaulding”
to set off the nonessential phrase that ends with “Mifflin.” Choice C
is incorrect because placing a comma after “Spaulding” and after“director” wrongly indicates that “the director” could be deleted
without changing the meaning of the sentence. Choice D is incorrect
because a dash can’t be paired with a comma to set off grammaticallynonessential information.

QUESTION 4

Choice A is the best answer. This choice most effectively combines
the sentences at the underlined portion because it’s concise andcorrectly indicates that Spaulding saw a need for appealing books
for beginning readers at the same time that he thought he knew who
should write one.
Choice B is incorrect because “namely” indicates that a more
specific restatement of an earlier point or an example will follow.
In this case, what follows the idea that Spaulding saw a need forappealing books is his thought about who should write one. Choice C
is incorrect because the repetition of Spaulding’s name is unnecessary.

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Choice D is incorrect because the adverb “meanwhile” is redundant;
the conjunction “and” is sufficient to indicate that Spaulding had
two thoughts simultaneously.

QUESTION 5

Choice D is the best answer. This choice, which indicates that
Geisel published nine children’s books and received three nominations
for the prestigious Caldecott Medal, supports the information that
follows in the sentence about Geisel being an experienced writerand illustrator.
Choices A, B, and C are incorrect. Geisel’s long relationship with
Spaulding, Geisel’s reputation for perfectionism and for setting highstandards, and his interest in politics don’t support the idea that Geisel
was an experienced writer and illustrator.

QUESTION 6

Choice A is the best answer; “however” correctly indicates that eventhough Geisel was an experienced writer and illustrator, the new
project presented him with an obstacle.
Choices B, C, and D are incorrect because none of these transitional
words or phrases shows the true relationship between the challenging
nature of the new project and Geisel’s experience. “For example,”“furthermore,” and “at any rate” indicate that what follows is an
instance of, additional to, or unrelated to what was stated in theprevious sentence.

QUESTION 7

Choice C is the best answer. The introductory phrase “on the verge ofgiving up” doesn’t have its own subject. Instead, the subject appears
at the beginning of the sentence’s main clause and makes clear what
is being described in the introductory phrase. “Geisel” is the logicalsubject of the sentence because he can be described as being “on theverge of giving up.”
Choices A, B, and D are incorrect because “Geisel’s story,” “an image,”and “the story” can’t be described as being “on the verge of giving up.”

QUESTION 8

Choice D is the best answer. This choice concisely indicates that it
took Geisel nine months to complete The Cat in the Hat.
Choices A, B, and C are incorrect because they’re repetitive.
“Duration” and “long” (choice A), “thirty-six weeks” (choice B), and“length” (choice C) unnecessarily repeat the idea that nine months
had passed.

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QUESTION 9

Choice D is the best answer. The underlined portion should be deleted
because it isn’t necessary. Since “were entertained” appears earlier inthe sentence, the past participle “captivated” is sufficient without therepetition of “were.”
Choices A, B, and C are incorrect because “is captivated,” “wascaptivated,” and “has been captivated” are singular verbs that don’t
agree in number with the plural subject “children.”

QUESTION 10

Choice C is the best answer. The comma after “followed” is usedcorrectly to separate the dependent phrase “in the years that followed”
from the independent clause that begins with “many.”
Choices A, B, and D are incorrect because a period, a semicolon, or adash can’t be used in this way to separate an introductory dependentphrase from an independent clause.

QUESTION 11

Choice C is the best answer. This choice indicates that The Cat in the
Hat’s success is attributable to its enduring ability to delight children
and engage them in learning how to read. This idea restates the main
themes of the passage, which are the need to make books appealing
to beginning readers and the importance of engaging those readers
through interesting plots and illustrations.
Choices A, B, and D are incorrect. The idea that the best proof of
The Cat in the Hat’s success is its limited vocabulary and appealing
word choices, its impressive worldwide sales, or its important role in
the history of twentieth-century illustration doesn’t restate the main
themes of the passage.

QUESTION 12

Choice D is the best answer. The gerund “picking up” is parallelin structure to the other gerunds in the sentence, “helping”
and “working.”
Choices A, B, and C are incorrect because they don’t maintainparallelism in the sentence. “When they pick up litter,” “to pick up
litter,” and “litter collection” don’t contain gerunds.

QUESTION 13

Choice A is the best answer. The transitional phrase “by its very
definition” points to the criticism in the previous paragraph that whenvolunteering is compulsory, it’s no longer volunteerism.

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Choices B, C, and D are incorrect because the reference to generalwork, students, or communities in need doesn’t highlight the criticism
of compulsory volunteering mentioned in the previous paragraph.

QUESTION 14

Choice D is the best answer. The plural noun “officials” correctly
refers to the people who require students to give up time for nonprofit
activities. Additionally, the plural possessive noun “students’”indicates that the choice to give up personal time is supposed tobelong to multiple students.
Choice A is incorrect because “officials’” is a plural possessive noun,
but nothing belongs to the officials in this sentence. Choice B isincorrect because “students” is a plural noun, but the plural possessive
noun “students’” is needed to indicate that the choice is supposed
to belong to students. Choice C is incorrect because “student’s” is asingular possessive noun, but the plural possessive noun “students’”is needed to show that the choice is supposed to belong tomultiple students.

QUESTION 15

Choice C is the best answer. This choice is clear and concise anddoesn’t repeat the idea of proponents that begins the sentence.
Choices A, B, and D are incorrect because they’re repetitive. Since
proponents are people who support a cause, describing proponents ofcompulsory volunteering as being in favor of it, advocating it, or being
advocates creates redundancy.

QUESTION 16

Choice B is the best answer. This choice, a closer connection
with their community, is a benefit of volunteering and provides asupporting example that is most similar to the other examples ofbenefits offered in the sentence: increased self-esteem and better
relationship-building skills.
Choices A, C, and D are incorrect because they don’t provide
supporting examples that are similar to the examples in the sentence.
Increasingly busy schedules, less time spent engaging in social
activities, and little increase in academic achievement aren’t benefitsof volunteering.

QUESTION 17

Choice B is the best answer. The infinitive “[to] affect” parallels
the earlier infinitive “[to] volunteer” (“are more likely to volunteer,”“[are more likely to] affect”). Moreover, “affect,” meaning “to influence,”
is used correctly to indicate that students who do community service
positively influence society.

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Answer Explanations | SAT Practice Test #10

Choices A and C are incorrect because the verb “effect” generallymeans “to bring about” and the noun “effect” means “result,” neitherof which makes sense in the sentence. Choice D is incorrect because
the singular verb “affects” doesn’t work here, where the infinitive“affect” is required.

QUESTION 18

Choice A is the best answer; “mandatory” is the most precise word touse when describing the volunteering that students are required to do.
Choices B, C, and D are incorrect because the meanings of thesewords don’t fit the context of the sentence. “Coercive” and “forcible”
suggest that threats or force are used to make someone do something.
“Imperative” suggests that something is very important or necessary.
None of these words is appropriate to use when describing thevolunteering that students are required to do.

QUESTION 19

Choice D is the best answer. The semicolon is used correctly toseparate the independent clause that begins with “she” from theindependent clause that begins with “they.” In addition, this choicecontains no unnecessary punctuation.
Choice A is incorrect because a comma can’t be used by itself tojoin two independent clauses. Choice B is incorrect because it’sunnecessary to place a comma between the adverb “then” and theverb “did,” which the adverb describes. Choice C is incorrect because
no punctuation is needed to separate the subject “they” from theadverb “then.”

QUESTION 20

Choice B is the best answer because “than did students who were”
results in a logical comparison between two types of students: those
who were required to volunteer (“they then did”) and those who
weren’t (“than did those”).
Choices A and C are incorrect because each illogically compares“hours” to students (“they”). Choice D is incorrect because it results ina nonstandard expression; “less” is already comparative, meaning that“compared with” isn’t appropriate.

QUESTION 21

Choice C is the best answer. The idea that schools should focus onoffering arrangements that make volunteering an easy and attractive
choice most effectively sets up the point made in the next sentence:
more students willingly volunteer when schools tell them about
volunteering opportunities and connect them with organizations.

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Choices A, B, and D are incorrect because they don’t effectively set
up the point made in the next sentence. The ideas that schools haveto recognize that not all students are equally well suited to the sameactivities, should allow students to spend their time participating
in athletics and other extracurricular activities, and are advised torecognize the limits of their ability to influence their students don’t set
up the point that students willingly volunteer when schools connect
them to volunteer opportunities and organizations.

QUESTION 22

Choice B is the best answer. This choice provides a conclusionthat states the main claim of the passage: schools that don’t makevolunteering compulsory will produce more engaged, enthusiastic
volunteers than will schools that require volunteer work.
Choices A, C, and D are incorrect. The idea that schools should findvolunteers for organizations in the United States, that psychologicaland economic studies have revolutionized understandings ofvolunteerism, or that students should choose charitable work thatsuits their interests and values doesn’t state the passage’s main claimthat schools that don’t require volunteering produce more engaged,
enthusiastic volunteers.

QUESTION 23

Choice C is the best answer. The present perfect tense verb “havebelieved” correctly indicates that scientists in the past believedthat the corpus callosum enables complex tasks and that scientists
continue to hold this belief in the present.
Choices A, B, and D are incorrect because they don’t describe a belief
that originated in the past and continues in the present. The present
progressive tense verb “are believing,” the future progressive tenseverb “will be believing,” and the simple present tense verb “believe”
aren’t appropriate to use in a case that requires a present perfecttense verb.

QUESTION 24

Choice A is the best answer. This choice concisely defines
handedness without unnecessarily repeating the ideas of preferenceor consistency.
Choices B and C are incorrect because “favor the use of” and “could bechosen,” respectively, repeat the idea of “prefer,” which appears earlier
in the sentence. Choice D is incorrect because “on a regular basis”
is synonymous with “consistently,” which also appears earlier inthe sentence.

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QUESTION 25

Choice A is the best answer. No punctuation is necessary between thenoun “trait” and the preposition “other than.”Choices B, C, and D are incorrect because neither a comma,
a semicolon, nor a colon is necessary to separate the noun “trait”
from the phrase that follows.

QUESTION 26

Choice B is the best answer. The phrase “correlates with” is idiomaticwhen indicating that two things are directly related to each other. In
the passage, handedness in marsupials is believed to be related to thetrait of bipedalism in those mammals.
Choices A, C, and D are incorrect because “links as,” “correlates from,”and “links on” aren’t idiomatic when indicating that two things are
directly related to each other.

QUESTION 27

Choice D is the best answer. According to the graph, positive mean
handedness index scores indicated a left-forelimb preference andnegative scores indicated a right-forelimb preference.
Choices A, B, and C are incorrect because they don’t accurately reflect
the information in the graph.

QUESTION 28

Choice B is the best answer. The comma after “kangaroo” andbefore the conjunction “and” is used correctly to separate the last
two items, “red kangaroo” and “brush-tailed bettong,” in the list of
bipedal marsupials.
Choice A is incorrect because the comma needs to be placed
immediately before the conjunction “and,” not after it. Choice C isincorrect because a semicolon isn’t used to separate individual items
in a simple list. Choice D is incorrect because a dash isn’t used toseparate items in a list, and the comma after “and” is unnecessary.

QUESTION 29

Choice C is the best answer. According to the graph, the four bipedal
marsupials had positive mean handedness index values between 0.4
and 0.6, which revealed their preference for using their left forelimbs.
Choices A, B, and D are incorrect because they don’t accurately reflect
the data in the graph. The four bipedal marsupials didn’t have positive
mean handedness index values less than 0.2 or greater than 0.6, andthey didn’t have mean handedness index values of 0.

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QUESTION 30

Choice C is the best answer. The transitional phrase “in contrast
to” provides the best transition from the previous paragraph, which
illustrates bipedal marsupials’ forelimb preference, to this paragraph,
which discusses how quadrupedal marsupials differ from their bipedal
counterparts by not showing a strong forelimb preference.
Choices A, B, and D are incorrect because they don’t provide atransition from the previous paragraph. The introductory phrases“having four feet,” “like most other mammals,” and “while using
their forelimbs for eating” don’t establish a connection between thediscussion of bipedal marsupials’ forelimb preference in the previous
paragraph and quadrupedal marsupials’ forelimb preference inthis paragraph.

QUESTION 31

Choice B is the best answer. A main claim of the passage is thatscientists now believe there’s a correlation between bipedalism andhandedness in marsupials. Choice B, by mentioning that bipedal
marsupials in the study demonstrated handedness, references thismain claim.
Choices A, C, and D are incorrect because they don’t present a main
claim of the passage. The passage isn’t about how kangaroos still
don’t exhibit handedness to the extent that humans do, the manythings scientists don’t understand about the marsupial brain, or
additional studies on the phenomenon of handedness that will need tobe performed with other mammals.

QUESTION 32

Choice B is the best answer. “Which” is a standard relative pronoun inreference to a concept such as a task.
Choice A is incorrect because “whom” is used to refer to people, notconcepts. Choice C is incorrect because “what” isn’t a typical relative
pronoun and isn’t idiomatic in context (“tasks in what handedness
may confer an evolutionary advantage”). Choice D is incorrect because“whose” nonsensically suggests that tasks have handedness.

QUESTION 33

Choice A is the best answer. No change is needed because this choiceconcludes the passage by recalling a topic from the first paragraphthat requires additional research: scientists’ enduring question about
how the left and right hemispheres of marsupials’ brains communicate
since these mammals lack a corpus callosum.

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Answer Explanations | SAT Practice Test #10

Choices B, C, and D are incorrect because none of these choices
concludes the passage by recalling a topic from the first paragraphthat requires additional research. The first paragraph doesn’t refer tothe minority of humans who are left handed, the fact that studies likethis one may someday yield insights into the causes of neurologicaldisorders, or an additional study to examine handedness in otheranimals that sometimes stand upright.

QUESTION 34

Choice C is the best answer. “Although these levels are impressive”
provides the most effective transition from the previous sentence,
which indicates the percent of surveyed companies that provide
employees with tuition assistance, to the information that follows inthis sentence, that even more companies should consider providing
such assistance.
Choice A is incorrect because “despite these findings” suggeststhat regardless of the percentages, more companies should consider
providing tuition assistance, which is illogical. Choice B is incorrect
because the information that follows in the sentence isn’t additional
to the 2014 study. Choice D is incorrect because the issue of whether
companies want or don’t want to provide tuition assistance isn’t
mentioned in the previous sentence.

QUESTION 35

Choice D is the best answer. This choice most effectively establishes
the main idea of the passage, which is that companies should offer
tuition assistance because doing so helps attract and retain employees.
This main idea is supported in the second paragraph, which argues
that tuition assistance appeals to highly motivated and disciplined
individuals, and in the third paragraph, which claims that employees
receiving tuition assistance often stay with their employers even after
they complete their degrees.
Choices A, B, and C are incorrect because they don’t establish
the passage’s main idea. The passage isn’t about increasing
customer satisfaction, solving the problem of rising tuition costs,
or strengthening the US economy.

QUESTION 36

Choice C is the best answer. The plural noun “workers” correctly
indicates that companies have more than one worker. The plural
noun “opportunities” indicates that employers offer workers multiple
chances for personal and professional development.
Choices A and B are incorrect because the plural possessive
nouns “workers’” and “opportunities’” should be the plural nouns“workers” and “opportunities,” since nothing belongs to the workers

401PART 4 | Eight Official Practice Tests with Answer Explanations

or opportunities in the sentence. Choice D is incorrect because thesingular nouns “worker” and “opportunity” should be plural, and theapostrophes indicating possession aren’t needed.

QUESTION 37

Choice B is the best answer. The main verb “stressed” provides asimple predicate for the subject “John Fox” to create a grammaticallycomplete sentence.
Choices A and C are incorrect because “who stressed” and “stressing”
leave the sentence without an independent clause. Choice D isincorrect because although “he stressed” gives the sentence an
independent clause, that clause is improperly joined by “and” to thephrases “John Fox” and “the director of dealer training at Fiat Chrysler
Automobiles in the United States.”

QUESTION 38

Choice C is the best answer. This choice most effectively combines
the sentences at the underlined portion because the pronoun “which”
creates a relative clause (“which . . . workers”) that clearly andconcisely describes “retain.”
Choice A is incorrect because “retention” repeats the idea of “retain,”which is already mentioned in the sentence. Choice B is incorrect because“retaining” repeats the idea of “retain,” and the pronoun “whom” repeats
the idea of “employees.” Choice D is incorrect because the pronoun “that”
doesn’t have a clear antecedent and therefore creates a vague sentence.

QUESTION 39

Choice C is the best answer. The subordinate conjunction “because”
begins the dependent clause “because their new qualifications
give them opportunities for advancement within the company.”
No punctuation is needed to separate this dependent clause from theindependent clause that directly precedes it.
Choices A and D are incorrect because placing a period or a semicolon
after “degrees” results in a rhetorically ineffective sentence fragment.
Choice B is incorrect because no punctuation is needed between thenoun and subordinate conjunction. (Although colons can be used to
introduce additional explanatory information in a sentence, they’re
not typically used between a main clause and a dependent clause
beginning with a subordinate conjunction such as “because.”)QUESTION 40

Choice D is the best answer. The comma after “(UTC)” is paired
correctly with the comma after “Lincoln” to set off grammaticallynonessential information. The information between the commas, which
describes who Valerie Lincoln is, could be removed and the sentence
would still make sense.
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Answer Explanations | SAT Practice Test #10

Choice A is incorrect because a comma is needed after “(UTC)” to
set off the grammatically nonessential phrase. Choices B and C areincorrect because neither a dash nor a colon can be paired with acomma to set off grammatically nonessential information.

QUESTION 41

Choice A is the best answer. The adjective “deep” is usedidiomatically with “knowledge” to indicate that Lincoln possessed
extensive, in-depth information about her industry.
Choice B is incorrect because “hidden” doesn’t make sense within thecontext of the sentence. A person whose knowledge is hidden wouldn’t
be an asset to a company. Choices C and D are incorrect because“large” and “spacious” aren’t idiomatic when describing the extent ofa person’s knowledge.

QUESTION 42

Choice D is the best answer. “Keeping down costs” clearly andconcisely identifies what businesses have succeeded in doing.
Choices A, B, and C are incorrect because they’re redundant. In
choice A, the verbs “minimizing” and “keeping down” are synonyms,
so only one is needed in the sentence. In choice B, “employees’coursework” isn’t needed because this phrase already appears
in the sentence. In choice C, “being effective” repeats the idea of“succeeded,” which appears earlier in the sentence.

QUESTION 43

Choice A is the best answer. The infinitive “[to] divert” isgrammatically correct when preceded by “are likely,” indicating thatclasses can redirect employees’ time and energy away from their jobs.
Choices B, C, and D are incorrect because “diverted,” “in diverting,”and “diversions for” create ungrammatical sentences.

QUESTION 44

Choice D is the best answer. To make the passage most logical, thesentence should be placed after the last sentence of paragraph 4.
The use of “still” in the inserted sentence indicates that a contrast towhat was stated previously will follow. Paragraph 4 ends by statingthat tuition reimbursement may not be appropriate in all cases, andthe inserted sentence indicates that despite this fact, employers
should give serious thought to investing in reimbursement programs.
Moreover, the inserted sentence restates the passage’s main claim and,
therefore, effectively concludes the passage.
Choices A, B, and C are incorrect because placing the sentence at theend of paragraph 1, 2, or 3 would result in an illogical passage.

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PART 4 | Eight Official Practice Tests with Answer Explanations

Section 3: Math Test – No Calculator
QUESTION 1

Choice B is correct. Subtracting z from both sides of 2z + 1 = z resultsin z + 1 = 0. Subtracting 1 from both sides of z + 1 = 0 results in z = −1.
Choices A, C, and D are incorrect. When each of these values
is substituted for z in the given equation, the result is a false
statement. Substituting −2 for z yields 2(−2) + 1 = −2, or −3 = −2.
11
11
Substituting ​  —  ​ for z yields 2 ​  — ​  + 1 = — , or 2 = —2222
1 for z yields 2(1) + 1 = 1, or 3 = 1.

( )QUESTION 2

Choice C is correct. To complete the purchase, the initial payment of$60 plus the w weekly payments of $30 must be equivalent to the $300
price of the television. The total, in dollars, of w weekly payments of$30 can be expressed by 30w. It follows that 300 = 30w + 60 can beused to find the number of weekly payments, w, required to complete
the purchase.
Choice A is incorrect. Since the television is to be purchased with an
initial payment and w weekly payments, the price of the television must
be equivalent to the sum, not the difference, of these payments. Choice B
is incorrect. This equation represents a situation where the television ispurchased using only w weekly payments of $30, with no initial paymentof $60. Choice D is incorrect. This equation represents a situation
where the w weekly payments are $60 each, not $30 each, and the initial
payment is $30, not $60. Also, since the television is to be purchasedwith weekly payments and an initial payment, the price of the televisionmust be equivalent to the sum, not the difference, of these payments.

QUESTION 3

Choice B is correct. Since the relationship between the merchandise
weight x and the shipping charge f (x ) is linear, a function in theform f (x ) = mx + b, where m and b are constants, can be used. In
this situation, the constant m represents the additional shipping
charge, in dollars, for each additional pound of merchandise shipped,
and the constant b represents a one-time charge, in dollars, forshipping any weight, in pounds, of merchandise. Using any twopairs of values from the table, such as (10, 21.89) and (20, 31.79),
and dividing the difference in the charges by the difference in the
31.79 − 21.89 ​, which simplifies
weights gives the value of m: m = —20 − 109.9
to ​  — , or 0.99. Substituting the value of m and any pair of values from10
the table, such as (10, 21.89), for x and f (x ), respectively, gives thevalue of b: 21.89 = 0.99(10) + b, or b = 11.99. Therefore, the functionf (x ) = 0.99x + 11.99 can be used to determine the total shipping chargef (x ), in dollars, for an order with a merchandise weight of x pounds.
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Answer Explanations | SAT Practice Test #10

Choices A, C, and D are incorrect. If any pair of values from the table
is substituted for x and f (x ), respectively, in these functions, theresult is false. For example, substituting 10 for x and 21.89 for f (x )in f (x ) = 0.99x yields 21.89 = 0.99(10), or 21.89 = 9.9, which is false.
Similarly, substituting the values (10, 21.89) for x and f (x ) into thefunctions in choices C and D results in 21.89 = 33.9 and 21.89 = 50.84,
respectively. Both are false.

QUESTION 4

Choice C is correct. It’s given that the graph represents y = h(x ), thus they-coordinate of each point on the graph corresponds to the height, in feet, ofa Doric column with a base diameter of x feet. A Doric column with a basediameter of 5 feet is represented by the point (5, 35), and a Doric column
with a base diameter of 2 feet is represented by the point (2, 14). Therefore,
the column with a base diameter of 5 feet has a height of 35 feet, and thecolumn with a base diameter of 2 feet has a height of 14 feet. It follows thatthe difference in heights of these two columns is 35 − 14, or 21 feet.
Choice A is incorrect. This value is the slope of the line and represents
the increase in the height of a Doric column for each increase in thebase diameter by 1 foot. Choice B is incorrect. This value represents
the height of a Doric column with a base diameter of 2 feet, or thedifference in height between a Doric column with base diameter of
5 feet and a Doric column with base diameter of 3 feet. Choice D isincorrect and may result from conceptual or calculation errors.

QUESTION 5_

ChoiceA is correct. The expression √9x 2 can be rewritten as__( √9 ​  )(​​ √x 2 ​  ). The square root symbol in an expression represents_
the principal square root, or the positive square root, thus_√9 = 3.
2
Since x > 0, taking_the square root of the second factor, √x  ​, gives x.
2
It follows that √9x is equivalent to 3x.
__

Choice B is incorr
ect and may result from rewriting √ 9x 2 as ( √9 ​  )(​​ x 2 )__rather than ( √9 ​  )(​​ √x 2 ​  ). Choices C and D are incorrect and may result
from misunderstanding the operation indicated by a radical symbol.
In both of these choices, instead of finding the square root of thecoefficient 9, the coefficient has been multiplied by 2. Additionally, inchoice D, x 2 has been squared to give x 4, instead of taking the squareroot of x 2 to get x.

QUESTION 6

Choice A is correct. Factoring the numerator of the rational(x + 1)(x − 1)
(x + 1)(x − 1)x2 − 1— . The expression —  ​expression ​  —x − 1 yields
x−1
x−1( )( )
x+1 x
−1
x
+1
—
—
to 1, it follows that ( ​  —1 ​  )(​​ ​  x − 1 ​  ) = ( ​  1 ​  )​(1) or x + 1. Therefore, the

x+1 x
−1
x
−1
—
—
can be rewritten as ​  —1 ​  ​​ ​  x − 1 ​  . Since x − 1 = 1, when x is not equal
given equation is equivalent to x + 1 = −2. Subtracting 1 from bothsides of x + 1 = −2 yields x = −3.

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PART 4 | Eight Official Practice Tests with Answer Explanations

Choices B, C, and D are incorrect. Substituting 0, 1, or −1, respectively,
for x in the given equation yields a false statement. Substituting
02 − 10 for x in the given equation yields — = −2 or 1 = −2, which is0−1
false. Substituting 1 for x in the given equation makes the left-hand012 − 1 —side ​  —equal to −2. Substituting
1 − 1 ​ = ​  0 , which is undefined and not(−1)2 − 1
−1 for x in the given equation yields ​  —−1 − 1 = −2, or 0 = −2, which isfalse. Therefore, these values don’t satisfy the given equation.

QUESTION 7

Choice D is correct. Since y = f (x ), the value of f (0) is equal to thevalue of f (x ), or y, when x = 0. The graph indicates that when x = 0,y = 4. It follows that the value of f (0) = 4.
Choice A is incorrect. If the value of f (0) were 0, then when x = 0, the valueof f (x ), or y, would be 0 and the graph would pass through the point (0, 0).
Choice B is incorrect. If the value of f (0) were 2, then when x = 0, the valueof f (x ), or y, would be 2 and the graph would pass through the point (0, 2).
Choice C is incorrect. If the value of f (0) were 3, then when x = 0, the valueof f (x ), or y, would be 3 and the graph would pass through the point (0, 3).

QUESTION 8_

Choice C is correct. Since point B lies on AD , angles ABC and
CBD are supplementary. It’s given that angle ABC is a right angle;
therefore, its measure is 90°. It follows that the measure of angle CBD
is 180° − 90°, or 90°. By the angle addition postulate, the measure ofangle CBD is equivalent to x ° + 2x ° + 2x °. Therefore, 90 = x + 2x + 2x.
Combining like terms gives 90 = 5x. Dividing both sides of thisequation by 5 yields x = 18. Therefore, the value of 3x is 3(18), or 54.
Choice A is incorrect. This is the value of x. Choice B is incorrect.
This is the value of 2x. Choice D is incorrect. This is the value of 4x.

QUESTION 9

Choice C is correct. The equation defining any line can be written
in the form y = mx + b, where m is the slope of the line and b is they-coordinate of the y-intercept. Line ℓ passes through the point (0, −4),
which is the y-intercept. Therefore, for line ℓ, b = −4. The slope of aline is the ratio of the difference between the y-coordinates of any
two points to the difference between the x-coordinates of the same
points. Calculating the slope using two points that line ℓ passes
0 − (−4)4−1. Since m = −1
through, (−4, 0) and (0, −4), gives m = _ = — ​(−4) − 0 −4
and b = −4, the equation of line ℓ can be written as y = (−1)x + (−4),
or y = −x − 4. Adding x to both sides of y = −x − 4 yields x + y = −4.
Choices A and B are incorrect. These equations both represent lines
with a positive slope, but line ℓ has a negative slope. Choice D isincorrect. This equation represents a line that passes through thepoints (4, 0) and (0, 4), not the points (−4, 0) and (0, −4).
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Answer Explanations | SAT Practice Test #10

QUESTION 10

Choice D is correct. Since the graph represents the equationy = 2x 2 + 10x + 12, it follows that each point (x, y ) on the graph is asolution to this equation. Since the graph crosses the y-axis at (0, k ),then substituting 0 for x and k for y in y = 2x 2 + 10x + 12 creates a true
statement: k = 2(0)2 + 10(0) + 12, or k = 12.
Choice A is incorrect. If k = 2 when x = 0, it follows that2 = 2(0)2 + 10(0) + 12, or 2 = 12, which is false. Choice B is incorrect.
If k = 6 when x = 0, it follows that 6 = 2(0)2 + 10(0) + 12, or 6 = 12,
which is false. Choice C is incorrect. If k = 10 when x = 0, it follows
that 10 = 2(0)2 + 10(0) + 12, or 10 = 12, which is false.

QUESTION 11

Choice A is correct. A circle in the xy-plane with center (h, k )and radius r is defined by the equation (x − h )2 + (y − k )2 = r 2.
Therefore, an equation of a circle with center (5, 7) and radius 2 is(x − 5)2 + (y − 7)2 = 22, or (x − 5)2 + (y − 7)2 = 4.
Choice B is incorrect. This equation defines a circle with center(−5, −7) and radius 2. Choice C is incorrect.
This equation defines_
a circle with center (5, 7) and radius √2 ​_This equation defines a circle with center (−5, −7) and radius √2 ​.

QUESTION 12

Choice B is correct. Since figures are drawn to scale unless otherwise
stated and triangle ABC is similar to triangle DEF, it follows that themeasure of angle B is equal to the measure of angle E. Furthermore,
it follows that side AB corresponds to side DE and that side BC
corresponds to side EF. For similar triangles, corresponding sides
AB DE
are proportional, so — = — . In right triangle DEF, the cosine of
BC EF
angle E, or cos(E ), is equal to the length of the side adjacent to angle E
divided by the length of the hypotenuse in triangle DEF. Therefore,ABDE
12cos(E ) = — , which is equivalent to — . Therefore, cos(E ) = — .
13
EFBC
Choice A is incorrect. This value represents the tangent of angle F,
or tan(F ), which is defined as the length of the side opposite angle F
divided by the length of the side adjacent to angle F. Choice C isincorrect. This value represents the tangent of angle E, or tan(E ), which
is defined as the length of the side opposite angle E divided by thelength of the side adjacent to angle E. Choice D is incorrect. This value
represents the sine of angle E, or sin(E ), which is defined as the lengthof the side opposite angle E divided by the length of the hypotenuse.

QUESTION 13

Choice C is correct. The x-intercepts of the graph of f (x ) = x 2 + 5x + 4
are the points (x, f (x )) on the graph where f (x ) = 0. Substituting 0
for f (x ) in the function equation yields 0 = x 2 + 5x + 4. Factoring
the right-hand side of 0 = x 2 + 5x + 4 yields 0 = (x + 4)(x + 1).
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PART 4 | Eight Official Practice Tests with Answer Explanations

If 0 = (x + 4)(x + 1), then 0 = x + 4 or 0 = x + 1. Solving both of theseequations for x yields x = −4 and x = −1. Therefore, the x-intercepts ofthe graph of f (x ) = x 2 + 5x + 4 are (−4, 0) and (−1, 0). Since both points
lie on the x-axis, the distance between (−4, 0) and (−1, 0) is equivalent to
the number of unit spaces between −4 and −1 on the x-axis, which is 3.
Choice A is incorrect. This is the distance from the origin to thex-intercept (−1, 0). Choice B is incorrect and may result from incorrectly
calculating the x-intercepts. Choice D is incorrect. This is the distancefrom the origin to the x-intercept (−4, 0).

QUESTION 14_

Choice B is correct. Squaring both sides of the equation √ 4x = x − 3yields 4x = (x − 3)2, or 4x = (x − 3)(x − 3). Applying the distributive
property on the right-hand side of the equation 4x = (x − 3)(x − 3)yields 4x = x 2 − 3x − 3x + 9. Subtracting 4x from both sides of
4x = x 2 − 3x − 3x + 9 yields 0 = x 2 − 3x − 3x − 4x + 9, which canbe rewritten as 0 = x 2 − 10x + 9. Factoring the right-hand side of
0 = x 2 − 10x + 9 gives 0 = (x − 1)(x − 9). By the zero product property,
if 0 = (x − 1)(x − 9), then 0 = x − 1 or 0 = x − 9. Adding 1 to both sidesof 0 = x − 1 gives x = 1. Adding 9 to both sides of 0 = x − 9 gives x = 9.
Substituting these values for x into the given equation will determine
whether they satisfy_the equation._Substituting 1 for x in the given
equation yields √ 4(1) = 1 − 3, or ​, which is false. Therefore,x = 1 doesn’t satisfy the_given equation._
Substituting 9 for x in thegiven equation yields ​or √ 36 = 6, which is true. Therefore,x = 9 satisfies the given equation.
Choices A and
C are incorrect because x = 1 doesn’t satisfy the given_
equation: √ 4x represents the principal square root of 4x, which can’t
be negative. Choice D is incorrect because x = 9 does satisfy thegiven equation.

QUESTION 15

Choice A is correct. A system of two linear equations has no solution if
the graphs of the lines represented by the equations are parallel and are
not equivalent. Parallel lines have equal slopes but different y-intercepts.
The slopes and y-intercepts for the two given equations can be found bysolving each equation for y in terms of x, thus putting the equations inaslope-intercept form. This yields y = 3x + 6 and y = − ​ _ ​   x + 2. The slope
2
and y-intercept of the line with equation −3x + y = 6 are 3 and (0, 6),
respectively. The slope and y-intercept of the line with equation ax + 2y = 4aare represented by the expression − ​ _ and the point (0, 2), respectively.
2
The value of a can be found by setting the two slopes equal to each other,awhich gives − ​ _ = 3. Multiplying both sides of this equation by −2 gives2
a = −6. When a = −6, the lines are parallel and have different y-intercepts.

( )

408

Answer Explanations | SAT Practice Test #10

Choices B, C, and D are incorrect because these values of a would
result in two lines that are not parallel, and therefore the resulting
system of equations would have a solution.

QUESTION 16

The correct answer is 2200. If the total shipping cost was $47,000,
then T = 47,000. If 3000 units were shipped to the farther location,then f = 3000. Substituting 47,000 for T and 3000 for f in the equation
T = 5c + 12f yields 47,000 = 5c + 12(3000). Multiplying 12 by 3000
yields 47,000 = 5c + 36,000. Subtracting 36,000 from both sides of theequation yields 11,000 = 5c. Dividing both sides by 5 yields c = 2200.
Therefore, 2200 units were shipped to the closer location.

QUESTION 17

The correct answer is 5. By definition of absolute value, if | 2x + 1 | = 5,then 2x + 1 = 5 or −(2x + 1) = 5, which can be rewritten as 2x + 1 = −5.
Subtracting 1 from both sides of 2x + 1 = 5 and 2x + 1 = −5 yields
2x = 4 and 2x = −6, respectively. Dividing both sides of 2x = 4 and
2x = −6 by 2 yields x = 2 and x = −3, respectively. If a and b are thesolutions to the given equation, then a = 2 and b = −3. It follows thenthat | a − b | = | 2 − (−3) | = | 5 |, which is 5. Similarly, if a = −3 and b = 2,
it follows that | a − b | = | −3 − 2 | = | −5 |, which is also 5.

QUESTION 18

The correct answer is 1.21. It’s given that each year, the value of theantique is estimated to increase by 10% over its value the previous
year. Increasing a quantity by 10% is equivalent to the quantity
increasing to 110% of its original value or multiplying the original
quantity by 1.1. Therefore, 1 year after the purchase, the estimatedvalue of the antique is 200(1.1) dollars. Then, 2 years after purchase,the estimated value of the antique is 200(1.1)(1.1), or 200(1.21) dollars.
It’s given that the estimated value of the antique after 2 years is
200a dollars. Therefore, 200(1.21) = 200a. It follows that a = 1.21.

QUESTION 19

The correct answer is 2500. Adding the given equations yields(2x + 3y) + (3x + 2y) = (1200 + 1300). Combining like terms yields
5x + 5y = 2500. Therefore, the value of 5x + 5y is 2500.

QUESTION 20

The correct answer is 20. Factoring the expression u 2 − t 2 yields(u − t )(u + t ). Therefore, the expression (u − t )(u2 − t 2) can be rewrittenas (u − t )(u − t )(u + t ). Substituting 5 for u + t and 2 for u − t in thisexpression yields (2)(2)(5), which is equal to 20.

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PART 4 | Eight Official Practice Tests with Answer Explanations

Section 4: Math Test – Calculator
QUESTION 1

Choice B is correct. It’s given that the helicopter’s initial height is
40 feet above the ground and that when the helicopter’s altitude begins
to increase, it increases at a rate of 21 feet per second. Therefore, thealtitude gain t seconds after the helicopter begins rising is represented
by the expression 21t. Adding this expression to the helicopter’s
initial height gives the helicopter’s altitude above the ground y, in feet,t seconds after the helicopter begins to gain altitude: y = 40 + 21t.
Choice A is incorrect. This is the helicopter’s altitude above theground 1 second after it began to gain altitude, not t seconds after
it began to gain altitude. Choice C is incorrect because adding theexpression −21t makes this function represent a decrease in altitude.
Choice D is incorrect and is the result of using the initial height of
40 feet as the rate at which the helicopter’s altitude increases per
second and the rate of 21 feet per second as the initial height.

QUESTION 2

Choice A is correct. The text messaging plan charges a flat fee of $5
per month for up to 100 text messages. This is represented graphicallywith a constant value of y = 5 for 0 ≤ x ≤ 100. After 100 messages, each
additional message sent costs $0.25. This is represented graphicallywith an increase of 0.25 on the y-axis for every increase of 1 on thex-axis. Choice A matches these descriptions.
Choice B is incorrect. This choice shows a linear decrease after x = 100,
indicating the price of the plan would decrease, rather than increase,
after 100 text messages. Choices C and D are incorrect. These choices
don’t represent a constant value of y = 5 for 0 ≤ x ≤ 100, which is needed
to represent the $5 per month for the first 100 text messages.

QUESTION 3

Choice B is correct. During the first 15 minutes Jake is in the theater,or from 0 to 15 minutes, Jake’s popcorn amount decreases by half. Thisis represented graphically by a linear decrease. From 15 to 45 minutes,
Jake stops eating popcorn. This is represented graphically by aconstant y-value. From 45 to 90 minutes, Jake eats more popcorn. Thisis represented graphically by another linear decrease as the amount of
popcorn in the bag gradually goes down. At 90 minutes, Jake spills allof his remaining popcorn. This is represented graphically by a vertical
drop in the y-value to 0. Choice B matches these representations.
Choices A, C, and D are incorrect. At no point during this period oftime did Jake buy more popcorn. All of these graphs represent anincrease in the amount of popcorn in Jake’s bag at some point during
this period of time.

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Answer Explanations | SAT Practice Test #10

QUESTION 4

Choice C is correct. Subtracting 20 from both sides of the given
equation yields −x = −5. Dividing both sides of the equation −x = −5 by−1 yields x = 5. Lastly, substituting 5 for x in 3x yields the value of 3x,
or 3(5) = 15.
Choice A is incorrect. This is the value of x, not the value of 3x.
Choices B and D are incorrect. If 3x = 10 or 3x = 35, then it follows
35
35
10
10
that x = _ or x = _, respectively. Substituting ​  _ ​and ​  _ for x in the
3
3
3
3
50
25
_
_
given equation yields ​ = 15 and ​ = 15, respectively, both of which
3
3
are false statements. Since 3x = 10 and 3x = 35 both lead to false
statements, then 3x can’t be equivalent to either 10 or 35.

QUESTION 5

Choice C is correct. The value of f (−1) can be found by substituting
x+3−1 + 3.
−1 for x in the given function f (x ) = _ , which yields f (−1) = _  ​222
Rewriting the numerator by adding −1 and 3 yields ​  _, which equals 1.
2
Therefore, f (−1) = 1.
Choice A is incorrect and may result from miscalculating the value−1 + 3−4of ​  _  ​as ​  _, or −2. Choice B is incorrect and may result from2
2
misinterpreting the value of x as the value of f (−1). Choice D
is incorrect and may result from adding the expression −1 + 3 in
the numerator.

QUESTION 6

Choice D is correct. To determine which option is equivalent to
the given expression, the expression can be rewritten using the
distributive property by multiplying each term of the binomial (x 2 − 3x )by 2x, which gives 2x 3 − 6x 2.
Choices A, B, and C are incorrect and may result from incorrectly
applying the laws of exponents or from various computation errors
when rewriting the expression.

QUESTION 7

Choice B is correct. Selecting employees from each store at random
is most appropriate because it’s most likely to ensure that thegroup surveyed will accurately represent each store location and all
employees.
Choice A is incorrect. Surveying employees at a single store location
will only provide an accurate representation of employees at thatlocation, not at all 50 store locations. Choice C is incorrect. Surveying
the highest- and lowest-paid employees will not give an accurate
representation of employees across all pay grades at the company.

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PART 4 | Eight Official Practice Tests with Answer Explanations

Choice D is incorrect. Collecting only the first 50 responses mimics theresults of a self-selected survey. For example, the first 50 employees
to respond to the survey could be motivated by an overwhelming
positive or negative experience and thus will not accurately represent
all employees.

QUESTION 8

Choice C is correct. The graph for Ian shows that the initial deposit
was $100 and that each week the total amount deposited increased by$100. Therefore, Ian deposited $100 each week. The graph for Jeremyshows that the initial deposit was $300 and that each week the total
amount deposited increased by $50. Therefore, Jeremy deposited $50
each week. Thus, Ian deposited $50 more than Jeremy did each week.
Choice A is incorrect. This is the difference between the initialdeposits in the savings accounts. Choice B is incorrect. This is theamount Ian deposited each week. Choice D is incorrect. This is half theamount that Jeremy deposited each week.

QUESTION 9

Choice C is correct. The value of the expression h(5) − h(3) can befound by substituting 5 and 3 for x in the given function. Substituting
5 for x in the function yields h(5) = 25, which can be rewritten as
h(5) = 32. Substituting 3 for x in the function yields h(3) = 23, which canbe rewritten as h(3) = 8. Substituting these values into the expression
h(5) − h(3) produces 32 − 8 = 24.
Choice A is incorrect. This is the value of 5 − 3, not of h(5) − h(3).
Choice B is incorrect. This is the value of h(5 − 3), or h(2), not ofh(5) − h(3). Choice D is incorrect and may result from calculation errors.

QUESTION 10

Choice D is correct. The margin of error is applied to the sample
statistic to create an interval in which the population statistic most
likely falls. An estimate of 23% with a margin of error of 4% creates aninterval of 23% ± 4%, or between 19% and 27%. Thus, it’s plausiblethat the percentage of students in the population who see a movie at
least once a month is between 19% and 27%.
Choice A is incorrect and may result from interpreting the estimateof 23% as the minimum number of students in the population who
see a movie at least once per month. Choice B is incorrect and may
result from interpreting the estimate of 23% as the minimum numberof students in the population who see a movie at least once per monthand adding half of the margin of error to conclude that it isn’t possiblethat more than 25% of students in the population see a movie at least
once per month. Choice C is incorrect and may result from interpretingthe sample statistic as the researcher’s level of confidence in the survey
results and applying the margin of error to the level of confidence.

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Answer Explanations | SAT Practice Test #10

QUESTION 11

Choice A is correct. The mean number of each list is found by dividing
the sum of all the numbers in each list by the count of the numbers
1+2+3+4+5+6
in each list. The mean of list A is ​  __ = 3.5, and62__+3+3+4+4+5
the mean of list B is ​ = 3.5. Thus, the means are the6same. The standard deviations can be compared by inspecting the
distances of the numbers in each list from the mean. List A contains
two numbers that are 0.5 from the mean, two numbers that are 1.5 fromthe mean, and two numbers that are 2.5 from the mean. List B contains
four numbers that are 0.5 from the mean and two numbers that are 1.5
from the mean. Overall, list B contains numbers that are closer to themean than are the numbers in list A, so the standard deviations of thelists are different.
Choice B is incorrect and may result from assuming that two data
sets with the same mean must also have the same standard deviation.
Choices C and D are incorrect and may result from an error in
calculating the means.

QUESTION 12

Choice C is correct. Let x represent the original price of the book.
Then, 40% off of x is (1 − 0.40)x, or 0.60x. Since the sale price is$18.00, then 0.60x = 18. Dividing both sides of this equation by 0.60
yields x = 30. Therefore, the original price of the book was $30.
Choice A is incorrect and may result from computing 40% of the saleprice. Choice B is incorrect and may result from computing 40% off thesale price instead of the original price. Choice D is incorrect and may
result from computing the original price of a book whose sale price is$18 when the sale is for 60% off the original price.

QUESTION 13

Choice C is correct. According to the bar graph, the number of
insects in colony A at week 0 was approximately 80, and this number
decreased over each respective two-week period to approximately 50,
32, 25, and 18. Similarly, the graph shows that the number of insects
in colony B at week 0 was approximately 64, and this number also
decreased over each respective two-week period to approximately 60,
40, 38, and 10. Finally, the graph shows that the number of insects
in colony C at week 0 was approximately 58; however, the number of
insects increased in week 2, to approximately 140. Therefore, onlycolony A and colony B showed a decrease in size every two weeks after
the initial treatment.
Choice A is incorrect. Colony B also showed a decrease in size every
two weeks. Choices B and D are incorrect. Colony C showed anincrease in size between weeks 0 and 2.

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PART 4 | Eight Official Practice Tests with Answer Explanations

QUESTION 14

Choice A is correct. According to the bar graph, the total numberof insects in all three colonies in week 8 was approximately
20 + 10 + 50 = 80, and the total number of insects at the time of initial
treatment (week 0) was approximately 80 + 65 + 55 = 200. The ratioof these approximations is 80 to 200, which is equivalent to 2 to 5.
Therefore, the ratio 2 to 5 is closest to the ratio of the total number of
insects in all three colonies in week 8 to the total number of insects atthe time of initial treatment.
Choices B, C, and D are incorrect and may result from setting up ratios
using weeks other than week 8 and week 0 or from calculation errors.

QUESTION 15

Choice B is correct. The formula for the volume V of a right circular1cone is V = _ ​  πr 2h, where r is the radius of the base and h is the height3of the cone. It’s given that the cone’s volume is 24π cubic inches and its
1height is 2 inches. Substituting 24π for V and 2 for h yields 24π = _ ​  πr 2(2).
32πRewriting the right-hand side of this equation yields 24π = ​ _ ​  r 2, which3
is equivalent to 36 = r 2. Taking the square root of both sides of thisequation gives r = ±6. Since the radius is a measure of length, it can’t benegative. Therefore, the radius of the base of the cone is 6 inches.

( )Choice A is incorrect and may result from using the formula for thevolume of a right circular cylinder instead of a right circular cone.
Choice C is incorrect. This is the diameter of the cone. Choice D isincorrect and may result from not taking the square root when solving
for the radius.

QUESTION 16

Choice C is correct. It’s given that the population of City X was 120,000
in 2010, and that it increased by 20% from 2010 to 2015. Therefore,
the population of City X in 2015 was 120,000 (1 + 0.20) = 144,000.
It’s also given that the population of City Y decreased by 10% from2010 to 2015. If y represents the population of City Y in 2010, then
144,000y(1 − 0.10) = 144,000. Solving this equation for y yields y = _ ​.
1 − 0.10
144,000
Simplifying the denominator yields _ , or 160,000.
0.90
Choice A is incorrect. If the population of City Y in 2010 was
60,000, then the population of City Y in 2015 would have been
60,000(0.90) = 54,000, which is not equal to the City X population in2015 of 144,000. Choice B is incorrect because 90,000(0.90) = 81,000,
which is not equal to the City X population in 2015 of 144,000.
Choice D is incorrect because 240,000(0.90) = 216,000, which is notequal to the City X population in 2015 of 144,000.

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Answer Explanations | SAT Practice Test #10

QUESTION 17

4
Choice D is correct. Dividing both sides of the equation V = _ ​  πr 3
3
3V4by ​  _ ​  π results in ​  _ = r 3. Taking the cube root of both sides produces ​
4π _
3
_
3 3V
3 3V
_
 ​= r. Therefore, ​  _ ​ ​ gives the radius of the sphere in terms of the​ 
4π
4π
volume of the sphere.

√√

Choice A is incorrect. This expression is equivalent to the reciprocal ofr 3. Choice B is incorrect. This expression is equivalent to r 3. Choice C
is incorrect. This expression is equivalent to the reciprocal of r.

QUESTION 18

Choice C is correct. It’s given that the tablet user did not answer“Never,” so the tablet user could have answered only “Rarely,” “Often,”or “Always.” These answers make up 24.3% + 13.5% + 30.9% = 68.7%of the answers the tablet users gave in the survey. The answer“Always” makes up 30.9% of the answers tablet users gave in the
0.309
30.9%
survey. Thus, the probability is ​  _ , or ​  _ = 0.44978, which
68.7%
0.687
rounds up to 0.45.
Choice A is incorrect. This reflects the tablet users in the survey whoanswered “Always.” Choice B is incorrect. This reflects all tablet users
who did not answer “Never” or “Always.” Choice D is incorrect. This
reflects all tablet users in the survey who did not answer “Never.”

QUESTION 19

Choice D is correct. The vertex form of a quadratic equation isy = n(x − h)2 + k, where (h, k) gives the coordinates of the vertex of theparabola in the xy-plane and the sign of the constant n determines
whether the parabola opens upward or downward. If n is negative,
the parabola opens downward and the vertex is the maximum.
The given equation has the values h = 3, k = a, and n = −1. Therefore,
the vertex of the parabola is (3, a) and the parabola opens downward.
Thus, the parabola’s maximum occurs at (3, a).
Choice A is incorrect and may result from interpreting the given
equation as representing a parabola in which the vertex is a minimum,
not a maximum, and from misidentifying the value of h in the given
equation as −3, not 3. Choice B is incorrect and may result frominterpreting the given equation as representing a parabola in which thevertex is a minimum, not a maximum. Choice C is incorrect and may
result from misidentifying the value of h in the given equation as −3,
not 3.

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PART 4 | Eight Official Practice Tests with Answer Explanations

QUESTION 20

Choice C is correct. Let m be the minimum value of the original data
set. The range of a data set is the difference between the maximum
value and the minimum value. The range of the original data set istherefore 84 − m. The new data set consists of the original set and thepositive integer 96. Thus, the new data set has the same minimum
m and a maximum of 96. Therefore, the range of the new data set is96 − m. The difference in the two ranges can be found by subtracting
the ranges: (96 − m) − (84 − m). Using the distributive property, thiscan be rewritten as 96 − m − 84 + m, which is equal to 12. Therefore,
the range of the new data set must be 12 greater than the range of theoriginal data set.
Choices A, B, and D are incorrect. Only the maximum value of theoriginal data set is known, so the amount that the mean, median, andstandard deviation of the new data set differ from those of the original
data set can’t be determined.

QUESTION 21

Choice B is correct. It’s given that Clayton uses 100 milliliters ofthe 20% by mass solution, so y = 100. Substituting 100 for y in thegiven equation yields 0.10x + 0.20(100) = 0.18(x + 100), which can be
rewritten as 0.10x + 20 = 0.18x + 18. Subtracting 0.10x and 18 fromboth sides of the equation gives 2 = 0.08x. Dividing both sides of thisequation by 0.08 gives x = 25. Thus, Clayton uses 25 milliliters of the 10%
by mass saline solution.
Choices A, C, and D are incorrect and may result from calculation errors.

QUESTION 22

Choice D is correct. It’s given that the number of people Eleanor
invited the first year was 30 and that the number of people invited
doubles each of the following years, which is the same as increasing
by a constant factor of 2. Therefore, the function f can be definedby f (n ) = 30(2)n, where n is the number of years after Eleanor beganorganizing the event. This is an increasing exponential function.
Choices A and B are incorrect. Linear functions increase or decreaseby a constant number over equal intervals, and exponential functions
increase or decrease by a constant factor over equal intervals.
Since the number of people invited increases by a constant factor
each year, the function f is exponential rather than linear. Choice C isincorrect. The value of f (n ) increases as n increases, so the function f
is increasing rather than decreasing.

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Answer Explanations | SAT Practice Test #10

QUESTION 23

Choice A is correct. The slope-intercept form of a linear equation in
the xy-plane is y = mx + b, where m is the slope of the graph of theequation and b is the y-coordinate of the y-intercept of the graph. Any
two ordered pairs (x1, y1) and (x2, y2) that satisfy a linear equation canbe used to compute the slope of the graph of the equation using they2 − y1
formula m = _x2 − x1 . Substituting t he two pairs (a, 0) and (3a, −a) from−a − 0
the table into the formula gives m = _ , which can be rewritten
3a − a−a1
as ​  _, or − _. Substituting t his value for m in the slope-intercept form
2a2
1of the equation produces y = − _x + b. Substituting values from the2
1ordered pair (a, 0) in the table into this equation produces 0 = − _ ​(a) + b,2awhich simplifies to b = _. Substituting t his value for b in the slope2a1intercept form of the equation produces y = − _x + _. Rewriting this221equation in standard form by adding _x to both sides and then2
multiplying both sides by 2 gives the equation x + 2y = a.
Choice B is incorrect and may result from a calculation error when
determining the y-intercept of the graph of the equation. Choices C
and D are incorrect and may result from an error in calculation when
determining the slope of the graph of the equation.

QUESTION 24

Choice B is correct. The slope-intercept form of a linear equation is
y = mx + b, where m is the slope of the graph of the equation and b is
the y-coordinate of the y-intercept of the graph. Any two ordered pairs(x1, y1) and (x2, y2) that satisfy a linear equation can be used to computey2 − y1
the slope of the graph of the equation using the formula m = _x2 − x1 ​.
Substituting the coordinates of (120, 60) and (160, 80), which lie on the
80 − 60
line of best fit, into this formula gives m = _ , which simplifies
160 − 12020
to ​  _ , or 0.5. Substituting this value for m in the slope-intercept form
40of the equation produces y = 0.5x + b. Substituting values from theordered pair (120, 60) into this equation produces 60 = 0.5(120) + b, so
b = 0. Substituting this value for b in the slope-intercept form of theequation produces y = 0.5x + 0, or y = 0.5x.
Choices A, C, and D are incorrect and may result from an error in
calculation when determining the slope of the line of best fit.

QUESTION 25

Choice A is correct. The intersection point (x, y) of the two graphs
can be found by multiplying the second equation in the system
1.6x + 0.5y = −1.3 by 3, which gives 4.8x + 1.5y = −3.9. The y-terms in
the equation 4.8x + 1.5y = −3.9 and the first equation in the system
2.4x − 1.5y = 0.3 have coefficients that are opposites. Adding the left- andright-hand sides of the equations 4.8x + 1.5y = −3.9 and 2.4x − 1.5y = 0.3
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PART 4 | Eight Official Practice Tests with Answer Explanations

produces 7.2x + 0.0y = −3.6, which is equivalent to 7.2x = −3.6. Dividing
both sides of the equation by 7.2 gives x = −0.5. Therefore, the xcoordinate of the intersection point (x, y) of the system is −0.5.
Choice B is incorrect. An x-value of −0.25 produces y-values of −0.6
and −1.8 for each equation in the system, respectively. Since the sameordered pair doesn’t satisfy both equations, neither point can be theintersection point. Choice C is incorrect. An x-value of 0.8 produces
y-values of 1.08 and −5.16 for each equation in the system, respectively.
Since the same ordered pair doesn’t satisfy both equations, neither
point can be the intersection point. Choice D is incorrect. An x-valueof 1.75 produces y-values of 2.6 and −8.2 for each equation in thesystem, respectively. Since the same ordered pair doesn’t satisfy both
equations, neither point can be the intersection point.

QUESTION 26

Choice D is correct. A model for a quantity that increases by r % perr ttime period is an exponential function of the form P (t ) = I 1+ ​  _ ​  ​​ ,100
where I is the initial value at time t = 0 and each increase of t by 1
represents 1 time period. It’s given that P (t ) is the number of pollen
grains per square centimeter and t is the number of years after the firstyear the grains were deposited. There were 310 pollen grains at time
t = 0, so I = 310. This number increased 1% per year after year t = 0,
so r = 1. Substituting these values into the form of the exponential
1 tfunction gives P (t ) = 310 1 + _ ​  , which can be rewritten as
100
P (t ) = 310(1.01)t.

(

(

)

)

Choices A, B, and C are incorrect and may result from errors madewhen setting up an exponential function.

QUESTION 27( )2
Choice A is correct. Subtracting ​ _ ​  (9x − 6) from both sides of the given
3
1equation yields −4 = ​ _ ​  (9x − 6), which can be rewritten as −4 = 3x − 2.
3
Choices B and D are incorrect and may result from errors made whenmanipulating the equation. Choice C is incorrect. This is the value of x.

( )QUESTION 28

Choice D is correct. The graph of a quadratic function in the formf (x ) = a(x − b)(x − c) intersects the x-axis at (b, 0) and (c, 0). The graphwill be a parabola that opens upward if a is positive and downward if
a is negative. For the function f, a = 1, b = −3, and c = k. Therefore, thegraph of the function f opens upward and intersects the x-axis at (−3, 0)and (k, 0). Since k is a positive integer, the intersection point (k, 0)
will have an x-coordinate that is a positive integer. The only graphthat opens upward, passes through the point (−3, 0), and has anotherx-intercept with a positive integer as the x-coordinate is choice D.

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Answer Explanations | SAT Practice Test #10

Choices A and B are incorrect. Both graphs open downward rather
than upward. Choice C is incorrect. The graph doesn’t pass throughthe point (−3, 0).

QUESTION 29

Choice D is correct. It’s given that L is the femur length, in inches, andH is the height, in inches, of an adult male. Because L is multipliedby 1.88 in the equation, for every increase in L by 1, the value of H
increases by 1.88. Therefore, the meaning of 1.88 in this context is thata man’s height increases by approximately 1.88 inches for each oneinch increase in his femur length.
Choices A, B, and C are incorrect and may result from misinterpretingthe context and the values the variables are representing.

QUESTION 30

Choice A is correct. A segment can be drawn inside of quadrilateral
ABCD from point B to point F (not shown) on segment AD such thatsegment BF is perpendicular to segment AD. This will create rectangle
FBCD such that FB = CD. This will also create right triangle ABF
1such that FB = _ ​  AB. An acute angle in a right triangle has measure2
30° if and only if the side opposite this angle is half the length of the
hypotenuse. (Such a triangle is called a 30°-60°-90° triangle.) Since
1
AB is the hypotenuse of right triangle ABF and FB = _ ​  AB, triangle ABF
2must be a 30°-60°-90° triangle and angle ABF must measure 60°. The
measure of angle ABC equals the sum of the measures of angles ABF
and FBC. Because angle FBC is in rectangle FBCD, it has a measureof 90°. Therefore, the measure of angle ABC, or angle B shown in theoriginal figure, is 60° + 90° = 150°.
Choice B is incorrect and may result from identifying triangle ABF as a
45°-45°-90° triangle and the measure of angle ABF as 45°. Choice C isincorrect and may result from adding the measures of angles BAF andFBC rather than angles ABF and FBC. Choice D is incorrect and may
result from finding the measure of angle D rather than angle B.

QUESTION 31

The correct answer is 6. It’s given that apples cost $0.65 each andoranges cost $0.75 each. If x is the number of apples, the cost forbuying x apples is 0.65x dollars. If y is the number of oranges, thecost for buying y oranges is 0.75y dollars. Lynne has $8.00 to spend;
therefore, the inequality for the number of apples and oranges Lynne
can buy is 0.65x + 0.75y ≤ 8.00. Since Lynne bought 5 apples, x = 5.
Substituting 5 for x yields 0.65(5) + 0.75y ≤ 8.00, which can be
rewritten as 3.25 + 0.75y ≤ 8.00. Subtracting 3.25 from both sides of theinequality yields 0.75y ≤ 4.75. Dividing both sides of this inequality by
0.75 yields y ≤ 6.33. Therefore, the maximum number of whole oranges
Lynne can buy is 6.
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PART 4 | Eight Official Practice Tests with Answer Explanations

QUESTION 32

The correct answer is 146. According to the triangle sum theorem,
the sum of the measures of the three angles of a triangle is 180°.
This triangle is made up of angles with measures of a°, b°, and c°.
Therefore, a + b + c = 180. Substituting 34 for a yields 34 + b + c = 180.
Subtracting 34 from each side of the equation yields b + c = 146.

QUESTION 33

The correct answer is 2500. The mean number of the list is found by
dividing the sum of all the numbers in the list by the count of numbersin the list. It’s given that the mean of the five numbers in this list is
700 + 1200 + 1600 + 2000 + x
1600; therefore, ​  ___ = 1600. Multiplying both
5sides of this equation by 5 gives 700 + 1200 + 1600 + 2000 + x = 8000.
The left-hand side of this equation can be rewritten as 5500 + x = 8000.
Subtracting 5500 from both sides of this equation gives x = 2500.

QUESTION 34

The correct answer is 34. Substituting the values y = 17 and x = a17
into the equation y = mx yields 17 = ma. Solving for a gives a = _m.
17This can be substituted for a in x = 2a, which yields x = 2 ​  _m ​  , or
34
34
34
_
_
x=_
m . Substituting x = m into the equation y = mx yields y = m ​  m ​  .
This equation can be rewritten as y = 34.

( )

( )

QUESTION 35

5
The correct answer is — . Applying the distributive property of2
multiplication on the left-hand side of a(x + b ) = 4x + 10 yields
ax + ab = 4x + 10. If a(x + b ) = 4x + 10 has infinitely many solutions,then ax + ab = 4x + 10 must be true for all values of x. It follows thatax = 4x and ab = 10. Since ax = 4x, it follows that a = 4. Substituting
4 for a in ab = 10 yields 4b = 10. Dividing both sides of 4b = 10 by5
10
4 yields b = _ ​, which simplifies to ​  _. Eit her 5/2 or 2.5 may be entered42
as the correct answer.

QUESTION 36

25
The correct answer is ​  — ​. If a line intersects a parabola at a point,4
the coordinates of the intersection point must satisfy the equation of
the line and the equation of the parabola. Since the equation of theline is y = c, where c is a constant, the y-coordinate of the intersection
point must be c. It follows then that substituting c for y in the equation
for the parabola will result in another true equation: c = −x 2 + 5x.
Subtracting c from both sides of c = −x 2 + 5x and then dividing bothsides by −1 yields 0 = x 2 − 5x + c. The solution to this quadratic
equation would give the x-coordinate(s) of the point(s) of intersection.

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Answer Explanations | SAT Practice Test #10

Since it’s given that the line and parabola intersect at exactly one point,
the equation 0 = x 2 − 5x + c has exactly one solution. A quadratic
equation in the form 0 = ax 2 + bx + c has exactly one solution whenits discriminant b 2 − 4ac is equal to 0. In the equation 0 = x 2 − 5x + c,
a = 1, b = −5, and c = c. Therefore, (−5)2 − 4(1)(c ) = 0, or 25 − 4c = 0.
Subtracting 25 from both sides of 25 − 4c = 0 and then dividing both25
sides by −4 yields c = _. Therefore, if the line y = c intersects the425parabola defined by y = −x 2 + 5x at exactly one point, then c = _ ​4
Either 25/4 or 6.25 may be entered as the correct answer.

QUESTION 37

The correct answer is 293. It’s given that a peregrine falcon’s
maximum speed while diving is 200 miles per hour and that
1 mile = 5280 feet. Therefore, a peregrine falcon’s maximum speed
feet
200 miles 5280
while diving is ​  _ ​  ​​ ​  _ ​  = 1,056,000 feet per hour.
1 hour
1 mileThere are 60 minutes in 1 hour and 60 seconds in each minute, so thereare (60)(60) = 3600 seconds in 1 hour. A peregrine falcon’s maximum
1,056,000 feet __1 hourspeed while diving is therefore ​  __ ​  ​​ ​  ​  ​, which
1 hour3600 seconds
is approximately 293.33 feet per second. To the nearest whole number,this is 293 feet per second.

(

)(

)

(

)(

)

QUESTION 38

The correct answer is 9. If x is the number of hours it will take thefalcon to dive 0.5 mile, then the speed of 200 miles per hour can be usedmile
200 miles 0.5 ​ = ​  _ . This proportionto create the proportion _1 hourx hours
0.5 mile_
can be rewritten as x hours =, which gives x = 0.0025.
miles
200 _
hour
There are 60 minutes in 1 hour and 60 seconds in each minute, so thereare (60)(60) = 3600 seconds in one hour. Therefore, 0.0025 hour is3600 seconds ​  = 9 seconds.
equivalent to (0.0025 hour) ​  __1 hour()

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