$$(\frac{5}{8})^{-7}\times(\frac{8}{5})^{-4}$$
$\frac{512}{125}=4.096$
$$\frac{2097152}{78125}\times \left(\frac{8}{5}\right)^{-4}$$
$$\frac{2097152}{78125}\times \frac{625}{4096}$$
$$\frac{512}{125}$$
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$\frac{2 ^ {9}}{5 ^ {3}} = 4\frac{12}{125} = 4.096$
