Answer:
Samuel is now at 588 feet down from the surface of water.
Explanation:
Samuel dives down 735 feet from the surface of the water.
It is represented by the integer = -735
Then rises back up 418 feet
It is represented by + 418.
Then dives down another 271 feet. It is represented by - 271
Samuel location now = - 735 + 418 - 271
= -317 - 271
= -588 feet
So, Samuel is 588 down from the surface of water.