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16 January, 14:00

When the air in a hot-air balloon is heated to 100 degrees Fahrenheit, each cubic foot of air can lift about 7 grams. The function f (x) for the number of grams that can be lifted by a balloon containing x ft^3of air is f (x)

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  1. 16 January, 15:21
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    Answer: f (x) = 7x

    See this table

    x [ ft^3 of air in the ballon] f (x) [grams that can be lifted]

    1 7

    2 14

    3 21
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