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Mathematics 18 Online
OpenStudy (anonymous):

The polynomial 0.0011x^3 - 0.07x^2 + 1.5x + 11 models natural gas consumption in trillions of cubic feet, where x=0 corresponds to 1960, x=1 to 1961, and so on. In which year between 1970 and 1990 was natural gas consumption about 21.9 trillion cubic feet?

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