Can anyone solve this?

The sum of two numbers is 86, and their difference is 20. find the two numbers

Rewrite the following quadratic functions in intercept or factored form. show your work. y = x^2 + 7x + 10

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?