What is the answer to this equation?

Iwill give you ! what is the measure of ∠v ?

How do i put 3(x+7) in distributive property

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