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6 February, 17:08

A miner descended 1500 feet into a mine. While in the mine, he then rose 1200 feet and then descended 850 feet. What was the miner's net gain or loss in altitude?

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  1. 6 February, 20:52
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    Call descending a negative number and rising a positive number.

    Then add the numbers.

    A miner descended 1500 feet into a mine.

    -1500 ft

    he then rose 1200 feet

    +1200 ft

    then descended 850 feet

    -850 ft

    Now add the three numbers:

    -1500 ft + 1200 ft + ( - 850 ft) = - 1150 ft

    Since the sum is a negative number, that means

    he had a net loss in altitude of 1150 ft.
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