A submarine is positioned negative 1 comma 525 feet in relation to sea level. The submarine needs to be negative 1 comma 865 feet below sea level in 20 minutes. Which best represents the rate at which the submarine needs to travel?

The submarine’s depth changes from −1,525 feet to −1,865 feet, a change of −1,865 − (−1,525) = −340 feet. Divide by 20 minutes: −340 ÷ 20 = −17 feet per minute. The negative rate means the submarine is moving farther below sea level, so the best choice is negative 17 ft/min.

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