The polynomial 0.0012 x cubed minus 0.075 x squared plus 1.6 x plus 13 0.0012x3−0.075x2+1.6x+13 models natural gas consumption in trillions of cubic feet, where x equals =0 corresponds to 1960, x equals =1 to 1961, and so on. How much natural gas was consumed in 1990?

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