【正确答案】 A

【答案解析】Column A: the area of a square of side a is a:. Column B: since the diameter of the circle is a, the radius is [*] , and so the area of the circle is [*] which is less than a2, [*]＜ 1. Column A is greater.

【正确答案】 B

【答案解析】To find the average speed, in miles per hour, divide the distance, in miles, by the time, in hours. All drove 90 miles [*] in 2.25 hours (135 minutes = 2 hours and 15 minutes = [*] hours). 90 + 2.25 = 40. Column B is greater.