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OpenStudy (anonymous):
the polynomial 0.0015x^3-0.09x^2+1.6x=11 models natural gas consumption in trillions of cubic feet, where x=0 corresponds to 1950,x=1 to 1961, and so on. In which year between 1970 and 1990 was natural gas consumtion about 18.3 trillion cubic feet?
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OpenStudy (anonymous):
x = 36.05, so in year 1986.
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