If 7 giant solar power plants generate 1.3 gigawatts (gw) of energy to power 900,000 homes, how many gigawatts can 21 giant solar plants generate?

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