Mathematics > Standard Multiple Choice
Read the following SAT test question and then click on a button to select your answer.
If 
, then 
(A) 7/9
(B) 9/7
(C) 5
(D) 7
(E) 14
The Correct answer is A.
Explanation
If 
, then by the commutative property of multiplication, 
. Multiplying each side of the latter equation by 
gives 
, so 
.