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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+7/2x=9/2x.Therefore,f(3/2)=27/4 .