Problem: Matrix groups consist of matrices together with matrix multiplication. The general linear group GL(n, R) consists of all invertible n-by-n matrices with real entries. Its subgroups are referred to as matrix groups or linear groups. The dihedral group example mentioned above can be viewed as a (very small) matrix group. Another important matrix group is the special orthogonal group SO(n). It describes all possible rotations in n dimensions. Via Euler angles, rotation matrices are used in computer graphics.
What matrix group portrays all possible rotations in n dimensions?
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Answer: the special orthogonal group SO(n)

Problem: In their attempt to ensure white supremacy decades after emancipation, in the early 20th century, most southern states created laws based on the one-drop rule, defining as black, persons with any known African ancestry. This was a stricter interpretation than what had prevailed in the 19th century; it ignored the many mixed families in the state and went against commonly accepted social rules of judging a person by appearance and association. Some courts called it "the traceable amount rule." Anthropologists called it an example of a hypodescent rule, meaning that racially mixed persons were assigned the status of the socially subordinate group.
What was the rule used in law in the 1900s called?
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Answer: the one-drop rule

Problem: Under Walter Dill Scott's presidency from 1920 to 1939, Northwestern began construction of an integrated campus in Chicago designed by James Gamble Rogers to house the professional schools; established the Kellogg School of Management; and built several prominent buildings on the Evanston campus, Dyche Stadium (now named Ryan Field) and Deering Library among others. In 1933, a proposal to merge Northwestern with the University of Chicago was considered but rejected. Northwestern was also one of the first six universities in the country to establish a Naval Reserve Officers Training Corps (NROTC) in the 1920s. Northwestern played host to the first-ever NCAA Men's Division I Basketball Championship game in 1939 in the original Patten Gymnasium, which was later demolished and relocated farther north along with the Dearborn Observatory to make room for the Technological Institute.
What was the orginal name for Northwestern's Ryan Field?
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Answer:
Dyche Stadium