Could you help me I got y’all with da points bro please

The volume of a cube is 8 in to the 3rd power. how long is each side?

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

Which shows one way to determine the facts of x3+4x2+5x+20 by grouping