Is 5x + 7 = 17 true false or open

Ineed i been stuck on this question since yesterday

What rotation was applied to triangle def to create d’e’f’?

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