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Mathematics>Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer.

If f（x）= x + ax, and a = 7/2, what is f(3/2) ?

(A) 1/3
(B) 3/2
(C) 7/2
(D) 21/4
(E) 27/4

答案和解析

答案：E

解析：

If f（x） = x + ax, and a = 7/2, then f（x） = x + (7/2)x = (9/2)x. Therefore, f(3/2) = (9/2)*(3/2) = 27/4.