SAT Math Multiple Choice Practice Question 82: Answer and Explanation

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Question: 82

16. If d1/2 + 5 = 9, then d-1 =

A. -16
B. -4
C. -2
D. 1/2
E. 1/16

Correct Answer: E

Explanation:

E. d1/2 is the same as , so and . This fact doesn't mean that , but it does mean that d = 42 = 16. So d-1 = (16)-1 = 1/16.

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