The polynominal .0012x^3-.09x^2+1.5x+13 models natural gas consumption in trillions cubic feet, where x=0 corresponds to 1960, x=1 to 1961 and so on. Between 1970 and 1990 gas was about 10.8 trillion cubic feet.
Natural gas consumption was 10.8 trillion cubic feet in year?

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You have to find x such that\[10.8 \times 10^{12}=0.0012x^3-0.09x^2+1.5x+13\]

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Actually, it should be\[10.8=0.0012x^3-0.09x^2+1.5x+13\]

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