standard_description: Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.
problem_activity: At a local bank, when you open an account, you provide certain information that is stored in the bank's records. The table below shows the names and mailing zip codes of some of the bank's customers.
{"table": [{"_attributes": {"align": "center", "class": ["table", "table-bordered"], "style": "table-layout:Fixed; width:50%"}, "tbody": [{"tr": [{"td": [{"_attributes": {"style": "background-color:#eeeeee; text-align:center"}, "strong": [{"_value": "Customer Name"}]}, {"_attributes": {"style": "background-color:#eeeeee; text-align:center"}, "strong": [{"_value": "Zip Code"}]}]}, {"td": [{"_attributes": {"style": "text-align:center"}, "_value": "Tyler Jackson"}, {"_attributes": {"style": "text-align:center"}, "_value": "70114"}]}, {"td": [{"_attributes": {"style": "text-align:center"}, "_value": "Justine Goodman"}, {"_attributes": {"style": "text-align:center"}, "_value": "12084"}]}, {"td": [{"_attributes": {"style": "text-align:center"}, "_value": "Tristan Manuel"}, {"_attributes": {"style": "text-align:center"}, "_value": "30311"}]}, {"td": [{"_attributes": {"style": "text-align:center"}, "_value": "Vanera Caro"}, {"_attributes": {"style": "text-align:center"}, "_value": "30311"}]}, {"td": [{"_attributes": {"style": "text-align:center"}, "_value": "Mia Lee"}, {"_attributes": {"style": "text-align:center"}, "_value": "20815"}]}]}]}]}
a.   Suppose
F
is the rule that takes a customer's name and provides their mailing zip code. According to the information in this table, is
F
a function? Explain your reasoning.
b.   Suppose
G
is the rule that takes a customer's mailing zip code and provides their name. According to the information in this table, is
G
a function? Explain your reasoning.
c.   If the bank is looking for a way to identify specific customers, why would using their zip code
not
be a good way to do this? What other input might the bank use instead?


aligns: no