Please answer im wasting pointss

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?

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)

Which is the best estimate of the product of 0.9 x 0.88? 0 0.25 0.5 1