How do you do this?

express the area of a rectangle with length 5m4 and width 6m2 as a monomial

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

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

If you answer 2+2 you will get over 80 points