Question

Pls help me with my homework​

Answer 1

`(1)/(81)`

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) } = (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.