Which expressions are equivalent?

select equivalent or not equivalent for each pair of expressions.

3(a−b) and 3a−3b

2a(2+b) and 4ab

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