Please help.

Which one ? is the answer and how to find this answer

Pamela has a 30-year, 5.75% mortgage on her $250,000 home. she has been paying on it for 5 years, and has recently hit some financial trouble. if her lender agreed to lower the interest rate on her $231,905.47 balance to 5.5%, what will her new payment be for the remainder of the loan?

V=x^4-y^4 pick three expressions that can represent the three dimensions of the prism (each in meters)