90 times the difference between a number and 83 is equal to the number plus -99

The number is equal to 83.18

Step-by-step explanation:

In order to find this number, we need to turn the words into numerical statements.

-90 times the difference between a number = -90(x - 83)

the number plus -99 = x + -99

Now we can set them equal to each other.

-90(x - 83) = x + -99 > Distribute

-90x + 7470 = x - 99 > Add 90x to both sides

7470 = 91x - 99 > Add 99 to both sides

7569 = 91x > Divide by 91

83.18 = x

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.

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step-by-step explanation: