I need a refresher on how to get the answer to these. Mark’s scores on his first three exams are 79, 84, and 71. What must Mark score on his next exam to average 77 for all four exams?

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?