After 5 days, the students in Mrs. Kane's class ate a total of 200 cookies. Each day they ate a total of 6 more cookies than they did the day before. How many total cookies did the students eat the first day?

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?