#### Answer

$81$; John multiplied the bases.

#### Work Step by Step

John multiplied the bases. The base should remain the same after the exponents are added.
$9^{-58}(9^{60})$
$9^2$
$81$

Published by
Brooks Cole

ISBN 10:
0-53449-636-9

ISBN 13:
978-0-53449-636-4

$81$; John multiplied the bases.

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