Find the perimeter of the rectangle

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)

Barbara deposited $300 in the bank. if the bank pays her simple interest at the rate of 4 percent per year, how much money will she have in her account at the end of 9 months?

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a