Question

What is 9 exponent of -2 simplified?

Answer 1

C is the answer because when you square nine you get 81 but you can't have a negative so you have to put a one over it as he numerator

Answer 2

remember
$x^{-m}= \frac{1}{x^m}$
so

$9^{-2}= \frac{1}{9^2}= \frac{1}{81}$

C is the answer