## Intermediate Algebra (6th Edition)

$y^{4}$
We are given the expression $\frac{y^{-3}}{y^{-7}}$. We can use the quotient rule to simplify, which holds that $\frac{a^{m}}{a^{n}}=a^{m-n}$ (where a is a nonzero real number, and m and n are integers). $\frac{y^{-3}}{y^{-7}}=y^{-3-(-7)}=y^{4}$