I need fast help with this pls show all the work

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

Which of the following is the missing term, a2, of the geometric sequence in which a1=2 and a3=200

What is the solution to the equation? k/6.4=8.7 2.3 5.568 15.1 55.68