write an expression that represents the height of a tree that begins at 7 feet and increases by 4 feet per year. let t represent the number of years. show your work

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