The fact that the difference between 5 and 7 is the same as the difference between 52 and 54 illustrates the mathematical property of

One of the primary reasons for undertaking the war in Afghanistan was __________

a. nation building b. protection of religious freedom c. retaliation for the bombing of the USS Cole d. protection of Iraq from Afghan military attacks

When did African Americans begin challenging the doctrine of segregation in the courts?

a. in the 1870s b. in the 1930s c. in the 1950s d. in the 1960s