confused. please answer and explain the reasoning so i can understand it

imart Tech signed a lease for a rental unit for 10 years. Under the lease agreement, a leposit of $9,000 is made. The deposit will be returned at the expiration of the lease with iterest compounded at 6% per year. What amount will Smart Tech receive at the time the ease expires? Jonathan has an investment that pays him $45,000 every year for the next 15 years. However, he would like to sell his investment today to purchase a house. Assume the going market interest rate is 9%, how much would a wise investor be willing to pay for this investment? Jenna wants to save up for a car which she will need when she graduates in 4 years. How much would she have to deposit today, if this amount would earn 7% per year, to have $29,000 when she graduates