Derek has 12 shirts in his closet. if 2 out of every 3 of these shirts are striped, how many striped shirts does derek have in his closet

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?