Given f(x)= 17-x^2 what is the average rate of change in f(x) over the interval [1,5]

Adecorative window is made up of a rectangle with semicircles at either end. the ratio of ad to ab is 3: 2 and ab is 30 inches. what is the ratio of the area of the rectangle to the combined area of the semicircles? possible answers: a. 2: 3 b. 3: 2 c. 6: π d. 9: π e. 30: π

Precalculus question, image attached.

(x-5)1/2+5=2 what is a possible solution?