Which expression is equivalent to 9–2?
–81
–18
startfraction 1 over 81 endfraction
startfraction 1 over 18 endfraction

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

answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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rauschg

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