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9 September, 15:29

Tomas works as an underwater photographer. He starts at a position that is 19 feet below sea level. He rises 9 feet, then descends 16 feet to take a photo of a coral reef. Enter an expression to find his position relative to sea level when he took the photo and then evaluate the expression.

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  1. 9 September, 16:36
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    19=9-16 would probably be something to go off of and begin your thought process with.
  2. 9 September, 17:07
    0
    Expression:

    X = Xo + 9 feet - 16 feet

    X = - 19 feet + 9 feet - 16 feet

    X = - 26 feet (26 feet below the sea level)

    Explanation:

    1) Call Xo the initial position, and X the variable to indicate the actual position

    2) Use position 0 for sea level

    3) use negative sign for positions under the sea level

    4) use positive sign for positions above the sea level

    5) Expression:

    Final position = initial position + movements upward - movements downward

    X = Xo + 9 feet - 16 feet

    X = - 19 + 9 feet - 16 feet = - 26 feet
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