The slope of the line

What is the radical expression that is equivalent to the expression 27 1 over 5?

If f(x) = 4x - 3 and g(x) = x + 4, find (f - g) (x)

Pamela has a 30-year, 5.75% mortgage on her $250,000 home. she has been paying on it for 5 years, and has recently hit some financial trouble. if her lender agreed to lower the interest rate on her $231,905.47 balance to 5.5%, what will her new payment be for the remainder of the loan?