Two numbers have a sum of 9 when added together. The same two numbers have a product of 20 when multiplied together.
Complete the table and write a system of equations to represent the two numbers.

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?