How do you figure out the arithmetic sequence of 8,9,10,-10

1) you deposit $2,500 in an account that earns 4% simple interest. how much do you earn in eight years?

Find the area of the region that is inside r=3cos(theta) and outside r=2-cos(theta). sketch the curves.

Someone answer this asap for the length, in feet, of a rectangular rug is represented by the expression 5x² + 2x. the width, in feet, is represented by the expression 3x². which expression represents the perimeter, in feet, of the rug? a. 8x² + 2x b. 8x² + 4x c. 16x² + 2x d. 16x² + 4x