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27-09-2022
Mathematics

Answered

When extended, the periscope of a submarine is about eighteen feet above sea level. When retracted, the top of the periscope is ten feet below sea level. Suppose that a number line is used to represent this situation, with sea level at zero. Which number sentence describes the relationship between the distance from the surface to the top of the periscope when it is extended and the distance from the surface of the water to the top of the periscope when it is retracted?

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