Azul bought 10 reams of paper at the store for a total of $84. the tax on the purchase was $4. what was the cost of each ream of paper? in a equation

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?