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If c = 3.905 X 10^x and x is a negative integer, what is x?

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If c = 3.905 X 10^x and x is a negative integer, what is x?  [#permalink]

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New post Updated on: 18 Jul 2017, 09:18
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If \(c = 3.905*10^x\) and x is a negative integer, what is x?


(1) \(0.00005 < c < 0.0005\)

(2) \(10^{-4} < c <10^{-3}\)

Originally posted by Mo2men on 18 Jul 2017, 09:14.
Last edited by Bunuel on 18 Jul 2017, 09:18, edited 1 time in total.
Edited the question.
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If c = 3.905 X 10^x and x is a negative integer, what is x?  [#permalink]

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New post 18 Jul 2017, 10:25
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If \(c = 3.905*10^x\) and x is a negative integer, what is x?


(1) \(0.00005 < c < 0.0005\)
clearly C must be 0.0003905...
Or \(5*10^{-5}<c<5*10^{-4}\). So x is -4
Sufficient


(2) \(10^{-4} < c <10^{-3}\)
this means x is between 0.0001 and 0.001...
Also 3.905*10^{-4} will be > 10^-4 and <10*10^-4...
Again x is -4
Sufficient


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Re: If c = 3.905 X 10^x and x is a negative integer, what is x?  [#permalink]

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New post 22 Apr 2019, 00:36
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Re: If c = 3.905 X 10^x and x is a negative integer, what is x?   [#permalink] 22 Apr 2019, 00:36
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