Number 2 please help

Reflect the point (7,0) across the y-axis

If you prove that ∆wxz is congruent to ∆yzx, which general statement best describes what you have proved?

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