SAT Math Multiple Choice Practice Question 146: Answer and Explanation

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Question: 146

14. If a-2/3 = 9, then a =

B. -6
E. 27

Correct Answer: C


C. To solve an equation like this one, you need to use the reciprocal of the exponent: . The exponents cancel each other out on the left side, leaving you with just a. On the right side, use a calculator if you want; if you do, make sure to put the exponent in parentheses when you type it in. To solve this problem the old-fashioned way, write .

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