3x + 1/4 y^2 What is the value of the expression above when x = 3 and y = 4? You must show all work and calculations to receive full credit. (4 points)

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?