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Mathematics 26 Online
OpenStudy (anonymous):

The polynomial 0.0014x to the 3rd power-0.085x to the 2nd power + 1.5x +12 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 trillion cubic feet.

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