How to find p at a given input in piecewise functions

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

If g^-1(x) is the inverse of g (x) which statement must be true

Adolphin is swimming with her friend. the dolphin jumps to a height of 4.54.54, point, 5 meters above the surface of the water as her friend swims 9.89.89, point, 8 meters directly below her. what is the position of the dolphin's friend relative to the surface of the water? meters