#### Answer

$r^{20}$

#### Work Step by Step

We start with the given expression: $(r^{-5})^{-4}$
To raise a power to a power, we multiply the exponents:
$r^{-5\times-4}=r^{20}$

Published by
Prentice Hall

ISBN 10:
0133500403

ISBN 13:
978-0-13350-040-0

$r^{20}$

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