Can you please answer eight and ten please?

In a graph with several intervals o data how does a constant interval appear? what type of scenario produces a constant interval?

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')

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