Which expression is equivalent to 9-2?

-81

-18

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1/81

Step-by-step explanation:

you would flip the 9^-2 which would be 1/9^2

which would simplify to 1/81

StartFraction 1 Over 81 EndFraction

Step-by-step explanation:

To get the equivalent expression for 9^-2, we will use the law of indices to solve it.

First we will remove the minus sign at the power, the removal of this sign will convert the value into a fraction. For example, one of the law of indices states;

a^-n = 1/a^n

Applying this law to the value given;

9^-2 = 1/9²

Next is to find the square of 9

9² = 9*9 = 81

Therefore our final answer will give;

9^-2 = 1/9²

= 1/81

The answer is B. StartFraction 1 Over 81 EndFraction