Question

A scientist uses a submarine to study ocean life.

She begins at sea level, which is an elevation of o feet.
She descends 23.6 feet.
• She then ascends 13.4 feet.
Next, she travels down a second time, 21.1 feet.
How many feet must she now rise to get back to sea level?

Answer 1

31.3 feet

Explanation:

0 -23.6 + 13.4 - 21.1 = -31.3

So to get back to sea level she must ascend 31.3 feet.

Answer 2

31.3 feet

Explanation:

-23.6+13.4 = -10.2

-10.2 - 21.1 = -31.3