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Mathematics 9 Online
OpenStudy (anonymous):

the polnmial 0.0012x^3-0.075x^2+1.7x+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 betwen 1970 and 1990 was natural gas consumption about 23.2 trillion cubic feet?

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