Gemma, a scuba diver, begins a dive on the side of a boat 4 feet above sea level. She descends 28 feet. Which integer represents Gemma’s position with respect to sea level?

Gemma starts 4 feet above sea level, represented by +4. Descending 28 feet gives 4 − 28 = −24, so she is 24 feet below sea level. The correct choice is –24.

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