What is an expressions that are equivalent to 7(3c).

Math it's appreciated. (picture provided)

Find the values of the variables and the lengths of the sides of this kite.

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?