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OpenStudy (anonymous):
If x and y are positive integers (3^x)^y=81 and 3^x+3^y=84 which of the following could be the value of x? a)2 b)3 c)4 d)5 e)6
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OpenStudy (anonymous):
Just sub the choices in 1 at a time and see....
OpenStudy (anonymous):
\[ 3^5 > 81 \\ 3^6>81 \] so d and e are not good choices
OpenStudy (anonymous):
Try to eliminate 2 more.
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