Write with Rational (Fractional) Exponents (1/( square root of y))^(-1/5)

${(\frac{1}{\sqrt{y}})}^{\frac{- 1}{5}}$

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{y}$ as $y^{\frac{1}{2}}$ .

${(\frac{1}{y^{\frac{1}{2}}})}^{\frac{- 1}{5}}$