Answer
$\color{blue}{z^{5/4}}$
Work Step by Step
RECALL:
$\sqrt[n]{a^m}=a^{m/n}$
Use the rule above with $a=z$, $m=5$, and $n=4$ to obtain:
$\sqrt[4]{z^5} = \color{blue}{z^{5/4}}$
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