Can you help me find the value of each shape plz

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

What is the value of x when x + 7 = 21?

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