Arecord album is 3/16 of an inch thick. how many albums can be stacked to fit in a box 12 inches high? show me how you got you answer explain

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