Geometry Question s

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

At the beginning of year 1, carlos invests $600 at an annual compound interest rate of 4%. he makes no deposits to or withdrawals from the account. which explicit formula can be used to find the account's balance at the beginning of year 5? what is, the balance?

1/2+1/6-3/4 simplify the given expression leaving the answer in improper fraction form.