$9=3^{2};\frac{1}{8}=(\frac{1}{2})^{3};\frac{-1}{27}=(\frac{-1}{3})^{3};\frac{81}{16}=(\frac{3}{2})^{4};\frac{8}{125}=(\frac{2}{5})^{3};0.0625=(0.5)^{4}$
$9=3^{2};\frac{1}{8}=(\frac{1}{2})^{3};\frac{-1}{27}=(\frac{-1}{3})^{3};\frac{81}{16}=(\frac{3}{2})^{4};\frac{8}{125}=(\frac{2}{5})^{3};0.0625=(0.5)^{4}$