PLEASE SOLVE THIS ASAP I NEED HELP

Bob borrows $450,000 to purchase a house. The annual interest rate on this loan is 6.75% and the term of the loan is 25 years. (a) What is the monthly mortgage payment to amortize this loan? (5 pts) (b) How much principal will Bob pay in the second year of this loan? (10 pts) (c) If Bob wants to prepay after the 10th year, how much will he have to pay? (5 pts) (d) If Bob wants to refinance this loan after the 10th year at 5.76% and keep the original loan term, how much is the new monthly mortgage payment? ( 5 pts) (e) If Bob wants to refinance this loan after the 10th year at 5.76% and keep the original monthly payment, how many months will he continue to make the payments on this loan? (5 pts)