Answer
$\frac{y}{25}$
Work Step by Step
We are given the expression $5^{-2}\times y$.
To simplify this into a positive exponent, we know that $a^{-n}=\frac{1}{a^{n}}$ (where a is a nonzero real number and n is a positive integer).
$5^{-2}\times y=\frac{y}{5^{2}}=\frac{y}{25}$