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Mathematics 7 Online
OpenStudy (anonymous):

The poloynomial 0.0011x^3-(-0.085x^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 12.6 trillion cubic feet?

OpenStudy (anonymous):

Help anyone?????

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