40$ 8% markup plz its for a good cause

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

The area (a) of a circle with a radius of r is given by the formula and its diameter (d) is given by d=2r. arrange the equations in the correct sequence to rewrite the formula for diameter in terms of the area of the circle.

Jonathan puts $400 in a bank account. each year the account earns 6% simple interest. how much interest will be earned in 5 years?