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

7 feet below the surface

Step-by-step explanation:

Lets consider down direction=+ve (positive) and up direction = - ve (negative).

A scuba diver dives down 15 feet into the ocean, therefore, position of scuba diver would be + 15 feet. (as we have considered down direction as positive)

He then swims 8 feet back up towards the surface, now, position of scuba diver would be - 8 feet (as we have considered up direction as negative)

So, overall position = 15 - 8 = 7 feet.

Therefore, the position of the scuba diver relative to the surface = 7 feet below the surface.