Find the slant height of this square pyramid 6 inches on each side

What are the values of each variable in the diagram below?

Which expression gives the exact value of x?

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