Answer
$ y\cdot \sqrt[3]{y^{2}}$
Work Step by Step
We apply $\qquad \sqrt[n]{y^{n}}=y,\qquad $ when n is odd.
$\sqrt[3]{y^{5}}= \sqrt[3]{y^{3}\cdot y^{2}}$
Apply $\sqrt[n]{a\cdot b}$ = $\sqrt[n]{a}\cdot \sqrt[n]{b}$
$= \sqrt[3]{y^{3}}\cdot \sqrt[3]{y^{2}} $
$=y \cdot \sqrt[3]{y^{2}}$
