Does anybody know how to do this? problem 13

This is geometry. could anyone ? i can't fail this class. my grade is quite low already.

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

You work in a hospital that has 9 floors. you need to see 3 patients on each floor. how many patients do you need to see in all?