Question

dake deposited $4000 in an account that earns 4% interest compounded annually.
(a.) Write an equation that expresses the amount of money in the accounr as a function of N,where < equals the # if years science the original deposit was made.
(B.)Use the equation in (A) and a calculator to determine how much money will be in the account after 9 years.
(C.) How much interest will have been earned after 9 years?

Please help me out I am very confused ! And If you can show your work so I would understand how to do it. thank you!!!