Adrian's cd player can hold six disks at a time and shuffles all of the albums and their songs. if he has thirteen cd's, how many different combinations of six cd's can he put in the player?

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?