In Exercises 5-12, find the inverse function of f informally. Verify that f(f-1(x)) = x and f-(f(x)) = x.
6. f(x) = 1/3x

Barrett is comparing the membership fees for two museums. the art museum charges a one-time fee of $8.25 plus $2.25 per month. the science museum charges a one-time fee of $10.75 plus $3.50 per month. how much does barrett save by joining the art museum instead of the science museum?