Question

a submarine was situated 800 feet below sea level. if it ascends 350 feet, then descends 125 feet, what is its final position?

Explanation:

Step1: Define initial position

Let's take below sea level as negative. So initial position is $-800$ feet.

Step2: Ascend 350 feet

Ascending means moving up (towards sea level), so we add 350. New position: $-800 + 350 = -450$ feet.

Step3: Descend 125 feet

Descending means moving down (away from sea level), so we subtract 125 (or add -125). Final position: $-450 - 125 = -575$ feet.

Answer:

The submarine's final position is 575 feet below sea level (or -575 feet relative to sea level).