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r=3^(n+2), then in terms of r, 9^n=

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r=3^(n+2), then in terms of r, 9^n=  [#permalink]

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New post 19 Feb 2011, 08:47
1
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A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

64% (01:44) correct 36% (01:58) wrong based on 215 sessions

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r=3^(n+2), then in terms of r, 9^n=

A. r^2/81
B. r^2/9
C. r^2
D. r/3
E. r

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Re: 9^n as r  [#permalink]

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New post 19 Feb 2011, 08:54
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Re: 9^n as r  [#permalink]

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New post 19 Feb 2011, 09:00
wow, u made it much simpler than me... thanks. +1
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Re: r=3^(n+2), then in terms of r, 9^n=  [#permalink]

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New post 14 May 2015, 23:20
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144144 wrote:
r=3^(n+2), then in terms of r, 9^n=

A. r^2/81
B. r^2/9
C. r^2
D. r/3
E. r


Questions in terms of variables can be easily solved by plugging in some values: Say n = 0
r = 3^2 = 9
and you need the value of 9^n which is 9^0 = 1

So when you put r = 9 in the options, you should get 1. Only option (A) satisfies.

Answer (A)
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Re: r=3^(n+2), then in terms of r, 9^n=  [#permalink]

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New post 12 Jan 2019, 08:24
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Re: r=3^(n+2), then in terms of r, 9^n=   [#permalink] 12 Jan 2019, 08:24
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