SSAT Math Question 224: Answer and Explanation

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Question: 224

8. (2.4 × 10^x)(3.0 × 10^y) =

A. 72 × 10^{x + y}
B. 7.2 × 10^x ⁺ ^y
C. 7.2 × 10^x ⁺ ^y ^{+ 1}
D. 7.2 × 10^xy

Correct Answer: B

Explanation:

The answer is B

Multiply the number terms inside the scientific notation first: 2.4 × 3.0 = 7.2. Multiply the exponential expressions with a base of ten. With like bases, add the exponents when you multiply the bases. (10^x)(10^y) = 10^{x + y}.

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