Ineed urgent algebra (see attachment) (6,7,8,9)

If f(x)= 3x+6 which of the following is the inverse of f(x)

What is the distance between point a and b

Onnie is considering doing some long term investing with money that she inherited. she would like to have $50,000 at the end of 30 years. approximately how much money would lonnie need to put into an account earning 6% interest compounded annually in order to meet her goal?