What is 9 x 9 is exponet form

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

How can you tell when x and y are not directly proportional?

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