How do i do this? express the following as trigonometric ratios of either 30, 45 or 60 degrees and hence find their exact values a) sin120 b) cos225 c) tan390

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?