Write an equation in standard form for the circle

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

Ben bowled 124 and 188 in his first two games. what must he bowl in his third game to have an average of at least 160?

Could somebody me with this radical simplification?