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Mathematics > Standard Multiple Choice

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

If square root (x) = 16, what is the value of square root (4 times x)?

 

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Right-o!

Explanation

The expression square root (4 times x) is equivalent to (square root 4)(square root x), and square root 4 = 2. Since square root x = 16, it follows that square root (4 times x) = (square root 4)(square root x) = (2)(16) = 32.

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