Please help me with questions 2-4 ASAP and explain

The total number of dental clinics total for the last 12 months was recorded

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

Find an bif a = {3, 6, 9, 12) and b = {2, 4, 6, 8, 10).