Help please... :(

Which is the product of 58 and 1,000? a. 0.058 b. 5,800 c. 58,000 d. 580,000

Which of these choices show a pair of equivalent expressions?

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