2,87 × 30 com cálculo

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Which expression gives the exact value of x?

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?