#### Answer

$\frac{1}{72}$

#### Work Step by Step

We convert to fractions, find a common denominator, and subtract:
$2^{-3}-3^{-2}=\displaystyle \frac{1}{8}-\frac{1}{9}=\frac{9}{72}-\frac{8}{72}=\frac{1}{72}$

Published by
Brooks Cole

ISBN 10:
1305115546

ISBN 13:
978-1-30511-554-5

$\frac{1}{72}$

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