Chris is standing on a cliff that is 3 feet above sea level. He dives into the water and descends to a depth 10 feet below the surface of the sea. On a number line, what is the distance between the two elevations?

Chris starts at 3 feet above sea level, or +3, and descends to 10 feet below sea level, or −10. The distance between the elevations is |3 − (−10)| = 13 feet. So the correct choice is 13.

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