A diver begins at 140 feet below sea level. She descends at a steady rate of 7 feet per minute for 4 point 5 minutes. Then, she ascends 112 point 2 feet. What is her current depth?

She starts 140 feet below sea level and descends another 7 × 4.5 = 31.5 feet, reaching 171.5 feet below sea level. Ascending 112.2 feet leaves her 171.5 − 112.2 = 59.3 feet below sea level. With below sea level represented by a negative number, her current depth is −59.3 feet, choice D.

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