Answer
$s^{4}$
Work Step by Step
According to the quotient rule for exponents, $\frac{a^{m}}{a^{n}}=a^{m-n}$ (where $a\ne0$).
Therefore, $\frac{s^{-4}}{s^{-8}}=s^{-4-(-8)}=s^{-4+8}=s^{4}$.
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