Answer
$\sqrt {rs^{3}}$
Work Step by Step
$\sqrt[4] {r^{2}s^{6}}=(r^{2}s^{6})^{\frac{1}{4}}=(r^{2})^{\frac{1}{4}}(s^{6})^{\frac{1}{4}}=(r)^{\frac{1}{2}}(s^{3})^{\frac{1}{2}}=\sqrt {rs^{3}}$
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