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GRE Math Challenge #22- Solve 5x +13 = 31
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07 Sep 2014, 06:37
07 Sep 2014, 06:37
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Question Stats:
82% (00:48) correct
17% (00:54) wrong based on 74 sessions
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If 5x +13 = 31, what is the value of \(\sqrt{5x + 31}\) ?
A. \(\sqrt{13}\)
B. \(\sqrt{\frac{173}{5}}\)
C. \(7\)
D. \(13\)
E. \(169\)
A. \(\sqrt{13}\)
B. \(\sqrt{\frac{173}{5}}\)
C. \(7\)
D. \(13\)
E. \(169\)
Re: GRE Math Challenge #22- Solve 5x +13 = 31
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16 Jan 2018, 02:23
16 Jan 2018, 02:23
x= 18/5
input 18/5 , get sqrt 49,ans is 7
input 18/5 , get sqrt 49,ans is 7
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Re: GRE Math Challenge #22- Solve 5x +13 = 31
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19 Jan 2018, 12:56
19 Jan 2018, 12:56
2
sandy wrote:
If 5x + 13 = 31, what is the value of \(\sqrt{5x + 31}\) ?
A. \(\sqrt{13}\)
B. \(\sqrt{\frac{173}{5}}\)
C. \(7\)
D. \(13\)
E. \(169\)
A. \(\sqrt{13}\)
B. \(\sqrt{\frac{173}{5}}\)
C. \(7\)
D. \(13\)
E. \(169\)
Given: 5x + 13 = 31
Add 18 to both sides to get: 5x + 31 = 49
We want to determine the value of \(\sqrt{5x + 31}\)
√(5x + 31) = √(49)
= 7
Answer: C
Cheers,
Brent
