A surveyor is measuring the height of a volcano. She measures the elevation of its base, at the bottom of the sea floor, at –16,400 feet. She measures the summit at an elevation of 13,680 feet. What is the total height of the volcano, from the base to the summit?

The volcano’s height is the difference between the summit elevation and the base elevation: 13,680 − (−16,400). Subtracting a negative is the same as adding, so 13,680 + 16,400 = 30,080 feet. The correct choice is 30,080 feet.

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