SAT Math Multiple Choice Practice Question 5: Answer and Explanation

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Question: 5

5. Evaluate .

A. -81
B. 1/81
C. 1/6
D. 3
E. 6

Correct Answer: B

Explanation:

B. This question isn't too bad as long as you remember your exponent rules. (Check out Chapter 14 if you need a refresher.) By definition, 40 = 1, and 641/2 is the square root of 64, which equals 8. So the expression in parentheses equals 1 + 8 = 9; 9-2 means the reciprocal of 92 (or 81), so the answer is 1/81.

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