Triangle abc has vertices a (1,5) b(9,7) and c (7,13) m is the midpoint of line ab and n is the midpoint of bc. what is the length of mn

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