Answer
$y^3\sqrt[5]{y^3}$
Work Step by Step
RECALL:
$\sqrt[n]{a^n}=a$
Factor the radicand (expression inside the radical sign) so that at least one factor is a perfect fifth power, and then use the rule above to simplify and obtain:
$=\sqrt[5]{y^{15} \cdot y^3}
\\=\sqrt[5]{(y^3)^5 \cdot y^3}
\\=y^3\sqrt[5]{y^3}$
