Please help me properties of arithmatic

Peaches cost $4.29 per pound. find the cost of two and a quarter pounds of peaches.

Abbey purchased a house using a fixed rate mortgage. the annual interest rate is 4.2% compounded monthly for 20 years. the mortgage amount is $235,000. what is the monthly payment on the mortgage? this isn't a multiple choice question have to show my work

The parabola opens: y=√x-4 (principal square root) up down right left