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ps question

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Jamesk486
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ps question [#permalink] New post   03 May 2007, 16:46
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@ Which of the following cannot be x in 1/3+{6/(9+x)}?
1) 3

2) 6

3) -2

4) -7

5) -11



@ 2.3 *10^k*4.6*10^m=1.058*10^n, n?



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Re: ps question [#permalink] New post   03 May 2007, 17:19
I don't know about the first one, but the answer to the second one is as follows:

2.3(10^k)*4.6(10^m)=1.058(10^n)
=10.58(10^k)(10^m)=1.058(10^n)

knowing that 1.058=10.58(10^-1) and also knowing that
a^x*a^y=a^x+y

we know that n=k+m-1
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Re: ps question [#permalink] New post   03 May 2007, 18:07
2)

n = k + m + 1

2.3 x 10^k x 4.6 x 10^m = 10.58 x 10^(k + m) => 1.058 x 10^(k + m + 1)

hence equating LHS with RSH, n = k + m + 1
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Re: ps question [#permalink] New post   03 May 2007, 20:22
Jamesk486 wrote:
@ Which of the following cannot be x in 1/3+{6/(9+x)}?
1) 3

2) 6

3) -2

4) -7

5) -11



@ 2.3 *10^k*4.6*10^m=1.058*10^n, n?


Not sure but .. something wrong with the question, I think.
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Re: ps question [#permalink] New post   04 May 2007, 09:44
Yeah I think question is not complete because x can be any of those values



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Re: ps question [#permalink]
04 May 2007, 09:44
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