Please help please!!

When using the linear combination metho e linear combination method to solve a system of linear equations, the four options are:

Melissa is purchasing a $160,000 home and her bank is offering her a 30-year mortgage at a 4.9% interest rate. in order to lower her monthly payment, melissa will make a 20% down payment and will purchase 3 points. what will her monthly mortgage payment be? a. $645.98 b. $650.46 c. $662.93 d. $606.69

Factor the gcf out of the polynomial 9x^6+6x^4+15x^3