I need help on this whole worksheet pls

Factor and solve to find roots x squared -x - 90 =0

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?

Isaac wants the equation below to have no solution when the missing number is placed in the box. which number should he place in the box?