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Mekhanik [1.2K]
3 years ago
13

Pls help me with my homework​

Mathematics
2 answers:
larisa86 [58]3 years ago
6 0

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

katovenus [111]3 years ago
4 0
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.
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