What is the average temperatures for 3°F, -5°F, 7°F, -9°F and -13°F

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

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

From the beginning of the day the temperature rose 15 degrees so that by 4 pm it was 87 degrees. what was the temperature at the start of the day