Please help me with this i suck at math

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

1. what is the formula for finding the vertical distance between two points on a coordinate plane?

Math each whole number with a rational, exponential expression