Question

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Answer 1

18.
$( \frac{1}{2} )^{x - 2} = \frac{1}{8} \\( 2 ^{ - 1} ) ^{x - 2} = 2 ^{ - 3} \\ 2 ^{ - x + 2} = 2 ^{ - 3} \\ - x + 2 = - 3 \\ - x = - 3 - 2 \\ - x = - 5 \\ x = 5$