Question

Pls help me with my homework​

Answer 1

Answer:

$\frac{1}{81}$

Step-by-step explanation:

express that with a positive exponent using this:

${a}^{ - n} \frac{1}{ {a}^{n} }$

so ..

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

now you have to evaluate the exponent/ power

so..

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

why 81 ?

because the exponent of 9 is 2 so you have to multiple 9 by itself so

9x9=81

so the answer is

$\frac{1}{ {81}^{} }$

sorry for the bad english hehe

Answer 2

9^-2 = 1/81 or 0.0123
When there is a negative in front of the exponent it makes a fraction. It is usually just 1/the number it equals if it were positive.