Mathematical Finance Question. Please provide a detailed response and I will be sure to upvote you.

2.16. (Equity in a House) A couple purchased a house 7 years ago for $375,000. The house was financed by paying 20% down and signing a 30 -year mortgage at 6.5% on the unpaid balance. The net market value of the house is now $400,000. Assume that the couple wishes to sell the house. a) How much equity (to the nearest dollar) does the family have in the house now, after making 84 monthly payments? b) Find the first interest payment I1 and the 84 th interest payment I84. 2.16. (Equity in a House) A couple purchased a house 7 years ago for $375,000. The house was financed by paying 20% down and signing a 30 -year mortgage at 6.5% on the unpaid balance. The net market value of the house is now $400,000. Assume that the couple wishes to sell the house. a) How much equity (to the nearest dollar) does the family have in the house now, after making 84 monthly payments? b) Find the first interest payment I1 and the 84 th interest payment I84