What are the domain and range of (fx) = [1/5]

How do i make someone brainliest? (if you answer me, i might be able to make you brainliest! )

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?

If the tip varies directly with the number of guest which equation represents between the tip, t, and the number of guest, g?