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If 1/x = 0.25^(1/2), what does x equal?

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If 1/x = 0.25^(1/2), what does x equal? [#permalink]

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New post 04 Mar 2018, 23:20
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A
B
C
D
E

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Re: If 1/x = 0.25^(1/2), what does x equal? [#permalink]

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New post 04 Mar 2018, 23:50
Bunuel wrote:
If \(\frac{1}{x} = \sqrt{0.25}\), what does x equal?


(A) 0.2
(B) 0.5
(C) 2
(D) 5
(E) 20


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If 1/x = 0.25^(1/2), what does x equal? [#permalink]

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New post 05 Mar 2018, 05:52
Bunuel wrote:
If \(\frac{1}{x} = \sqrt{0.25}\), what does x equal?


(A) 0.2
(B) 0.5
(C) 2
(D) 5
(E) 20



Given: \(\frac{1}{x} = \sqrt{0.25}\)

Squaring on both sides, we get \(\frac{1}{x^2} = 0.25\) -> \(x^2 = \frac{1}{0.25} = \frac{100}{25} = 4\)

Therefore, x = \(\sqrt{4}\) = 2(Option C)
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Re: If 1/x = 0.25^(1/2), what does x equal? [#permalink]

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New post 05 Mar 2018, 06:54
Bunuel wrote:
If \(\frac{1}{x} = \sqrt{0.25}\), what does x equal?


(A) 0.2
(B) 0.5
(C) 2
(D) 5
(E) 20

\(\frac{1}{x} = \sqrt{0.25}\)

Or, \(\frac{1}{x} = \sqrt{\frac{25}{100}}\)

Or, \(\frac{1}{x} = \frac{5}{10}\)

So, \(\frac{1}{x} = 0.50\), Answer must be (B)
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Re: If 1/x = 0.25^(1/2), what does x equal? [#permalink]

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New post 06 Mar 2018, 11:21
Bunuel wrote:
If \(\frac{1}{x} = \sqrt{0.25}\), what does x equal?


(A) 0.2
(B) 0.5
(C) 2
(D) 5
(E) 20


We can solve for x:

1/x = √0.25

1/x = 0.5

1 = 0.5x

1/0.5 = x

2 = x

Answer: C
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Re: If 1/x = 0.25^(1/2), what does x equal? [#permalink]

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New post 06 Mar 2018, 11:47
Abhishek009 wrote:
Bunuel wrote:
If \(\frac{1}{x} = \sqrt{0.25}\), what does x equal?


(A) 0.2
(B) 0.5
(C) 2
(D) 5
(E) 20

\(\frac{1}{x} = \sqrt{0.25}\)

Or, \(\frac{1}{x} = \sqrt{\frac{25}{100}}\)

Or, \(\frac{1}{x} = \frac{5}{10}\)

So, \(\frac{1}{x} = 0.50\), Answer must be (B)



Answer must be C not B
1/x^2=25/100
1/x=1/2
x=2
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Re: If 1/x = 0.25^(1/2), what does x equal? [#permalink]

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New post 06 Mar 2018, 11:56
Abhishek009 wrote:
\(\frac{1}{x} = \sqrt{0.25}\)

Or, \(\frac{1}{x} = \sqrt{\frac{25}{100}}\)

Or, \(\frac{1}{x} = \frac{5}{10}\)

So, \(\frac{1}{x} = 0.50\), Answer must be (B)


Hey Abhishek009 ,

You did everything correct but the last step.

We are asked to determine x not 1/x. Hence, answer must be 2 i.e
C :)
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Re: If 1/x = 0.25^(1/2), what does x equal? [#permalink]

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New post 06 Mar 2018, 12:06
0.25 = 1/4
^ 1/2 = sqrt(everything that is raised to this power)
(1/2)^1/2 = sqrt(1/4) = 1/2
1/x = 1/2
x=2
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If 1/x = 0.25^(1/2), what does x equal? [#permalink]

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New post 11 Mar 2018, 04:54
Bunuel wrote:
If \(\frac{1}{x} = \sqrt{0.25}\), what does x equal?


(A) 0.2
(B) 0.5
(C) 2
(D) 5
(E) 20


Given: \(\frac{1}{x} = \sqrt{0.25}\)

Question : x =?

\(\frac{1}{x^2}\) = \(\frac{25}{100}\)

\(\frac{1}{x^2}\) = \(\frac{1}{4}\)

\(x^2\)= 4

x =\(\sqrt{4}\)

x = 2

(C)
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If 1/x = 0.25^(1/2), what does x equal?   [#permalink] 11 Mar 2018, 04:54
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