Help please

Hey free points ! people i have a few math questions on my profile consider looking at them i have to get done in 30 mins!

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

Aright triangle can also be a(n) triangle.