​ Please help!

$\left(32x^{20}y^{-15}\right)^{-\frac 4 5}\\~\\ 1)~\text{apply the outer exponent}\\~\\ \left(32^{-4/5}x^{-16}y^{12}\right)\\~\\ 2)~ \text{put negative exponents into the denominator}\\~\\ \dfrac{y^{12}}{32^{4/5}x^{16}}\\~\\ 3) ~\text{note that $32^{4/5} = 2^4=16$}\\~\\ \dfrac{y^{12}}{16x^{16}}$