X^2-2x-8 / x^2-16 simply and find restrictions

Rewrite the following without an exponent. (5/8)-1

The perimeter of a quarter circle is 14.28 miles. what is the quarter circle's radius?

Sanderson is having trouble with his assignment. his shown work is as follows: − 3 7 7 3 = − 3 7 × 7 3 = − 21 21 = −1 however, his answer does not match the answer that his teacher gives him. complete the description of sanderson's mistake. find the correct answer.