Answer
$\frac{10}{b}$
Work Step by Step
We are given the expression $10b^{-1}$.
In general, we know that $a^{-n}=\frac{1}{a^{n}}$ (where a is a nonzero real number and n is an integer).
Therefore, $10b^{-1}=10\times\frac{1}{b}=\frac{10}{b}$.
Since the 10 is not in parentheses with b, we evaluate the exponent with only $b$ as its base.