A submarine started 30 feet below the surface of the water. It is now 10 feet below the surface. What integer represents the change in depth

A submarine started 30 feet below the surface of the water. It is now 10 feet below the surface. What integer represents the change in depth?

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  1. Answer:

    -20 feet

    Step-by-step explanation:

    change in depth = number of feet below the surface + number of depth on the surface

    Because the submarine is below surface, a value of -30 would be given

    -30 + 10 = -20 feet

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