Factor completely 21x^3+35x^2+9x+15

Do u just plot the numbers on the graph like (1,

27 is what percent of 108? 27 is % of 108

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?