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What the value of w^-2?

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jjjinapinch Senior | Next Rank: 100 Posts Default Avatar
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What the value of w^-2?

Post Thu Jul 27, 2017 12:02 pm
What the value of w^-2?

(1) w^-1 = 1/2
(2) w^3 = 8

Official Guide question
Answer: D

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Post Thu Jul 27, 2017 12:22 pm
jjjinapinch wrote:
What the value of w^-2?

(1) w^-1 = 1/2
(2) w^3 = 8

Official Guide question
Answer: D
Target question: What is the value of w^-2?

Statement 1: w^(-1) = 1/2
w^(-1) = 1/w
So, statement 1 is telling us that 1/w = 1/2, which means w = 2, which means w^(-2) = 2^(-2) = 1/4
Since we can answer the target question with certainty, statement 1 is SUFFICIENT

Statement 2: w^3 = 8
Only one value of w satisfies this equation: w = 2, which means w^(-2) = 2^(-2) = 1/4
Since we can answer the target question with certainty, statement 2 is SUFFICIENT

Answer: D

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Brent

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