Let f(x) = x2 − 81. find f−1(x). (1 point) ±square root of the quantity x plus 81 9 square root of x 1 over quantity x squared minus 81 x squared over 81

Collin did the work to see if 10 is a solution to the equation r/4=2.4

There were 25 students who answered to a survey about sports. four-fifths of them like football. how many students like football?

Th perimeter of a rectangular garden is 150 feet. the length is 50 feet longer than the width, w. which equation could be used to calculate the width of the garden? a.) 2w+ 2(w-50) =150 b.) 2w+50 + 2w =150 c.) 2(w+50) + w =150 d.) 2w+ 2(w + 50) = 150 need asap. will give brainliest !