# How do you simplify and write x^2/y^-4 with positive exponents?

The simplified expression is ${x}^{2} {y}^{4}$. Since $\frac{1}{a} ^ - b = {a}^{b}$, we just have to remove the denominator by using that rule:
${x}^{2} / {y}^{-} 4 = {x}^{2} \cdot {y}^{4} = {x}^{2} {y}^{4}$