Question

A scientist uses a submarine to study ocean life.

She begins at sea level, which is an elevation of 0 feet.
She travels down 4.2 feet.
She then travels directly up 3.4 feet.
Next, she descends a second time, 10 feet.

Answer 1

Below

Explanation:

0 ft -4.2 + 3.4 - 10 = -10.8 ft or 10.8 ft below the surface