3-4 practice exponential and logarithmic equations

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

In which form is the following function written? y = - 2(x – 3)(x + 5)

Find two numbers if their sum is 91 and the ratio is 6: 7?