What is HFC of 204 and 396

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 lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?

When 142 is added to a number the result is 64 more then 3 times the number. option 35 37 39 41