A musician spends 90 minutes practicing piano and guitar the time spent is 30 minute less than twice the same time spent on guit
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The answer is A, 
. This is because when plugging in -2 for x, the expression will look like this: 
. To make the exponent positive, you have to flip it into a fraction. Then it will be 
. Lastly, you simplify the denominator into 81.
