Use conditional proof or indirect proof and the eighteen rules of inference to establish the truth of the following tautologies. P â£[P V(Q . ~ Q)]

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