A scuba diver dives down 15 feet into the ocean. He then swims 8 feet back up towards the surface. What is the postion of the scuba diver relative to the surface.

Final position of scuba diver = 7 feet below the surface.

Explanation;

Let us take down direction as positive and up direction as negative.

A scuba diver dives down 15 feet into the ocean, position of scuba diver = + 15 feet.

He then swims 8 feet back up towards the surface, position of scuba diver = - 8 feet

Overall position = 15 - 8 = 7 feet.

So final position of scuba diver = 7 feet below the surface.