An amphitheatre has 24 seats in the first row, 28 in the second, 32 in the third, and so on, for 24 rows. How many seats are in the amphitheatre?

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