SAT I 一日一问：2013年1月23日-打印版式-

Mathematics > Standard Multiple Choice

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

If function f of x = x + a times x , and a = 7 over 2 , what is function f of (3 over 2) ?

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

The Correct answer is E.

Explanation

If function f of x = x + a times x , and a = 7 over 2 , then function f of x = x + (7 over 2) times x = (9 over 2) times x . Therefore, function f of (3 over 2) = (9 over 2) times (3 over 2) = 27 over 4 .