Answer
$\frac{s^2}{2}$
Work Step by Step
You have $\frac{5s^-{^7}}{10s^-{^9}}$.Solve:
$\frac{5s^-{^7}}{10s^-{^9}}$ -cancel the common factor:5-
$\frac{s^-{^7}}{2s^-{^9}}$ -apply exponent rule $\frac{x^a}{x^b}$=$x^{a-b}$-
$s^{-7-(-9)}$=$s^{2}$
=$\frac{s^2}{2}$
