If a = 5, B = 4, and c = 7, find the value for 3(b + a) - c.

A. 34

B. 20

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