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Which of the following is closest to (4.2(1,590)/15.7)^(1/2)
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08 Jun 2020, 06:56
08 Jun 2020, 06:56
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Which of the following is closest to \(\sqrt{\frac{4.2(1,590)}{15.7}}\)?
A. 20
B. 40
C. 60
D. 80
E. 100
A. 20
B. 40
C. 60
D. 80
E. 100
Re: Which of the following is closest to (4.2(1,590)/15.7)^(1/2)
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08 Jun 2020, 06:56
08 Jun 2020, 06:56
Expert Reply
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Which of the following is closest to (4.2(1,590)/15.7)^(1/2)
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08 Jun 2020, 08:07
08 Jun 2020, 08:07
Carcass wrote:
Which of the following is closest to \(\sqrt{\frac{4.2(1,590)}{15.7}}\)?
A. 20
B. 40
C. 60
D. 80
E. 100
A. 20
B. 40
C. 60
D. 80
E. 100
ALWAYS check the answer choices before solving the question!
When we do so, we see that the answer choices are VERY spread apart, which means we can save a ton of time by being super aggressive with our approximations (aka rounding)
So, we get: \(\sqrt{\frac{4.2(1,590)}{15.7}} ≈ \sqrt{\frac{4(1,600)}{16}}\)
\(≈ \sqrt{4(100)}\)
\(≈ \sqrt{400}\)
\(≈ 20\)
Answer: A
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