#### Answer

$3$

#### Work Step by Step

RECALL:
$\sqrt[n]{a} = a^{1/n}$
Use the rule above by to obtain:
$\sqrt[4]{81} = 81^{1/4}$
Since $81=3^4$, then
$\color{blue}{81^{1/4} = 3}$

Published by
Pearson

ISBN 10:
013421742X

ISBN 13:
978-0-13421-742-0

$3$

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