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The worldwide consumption of cigarettes has been increasing steadily in recent years. The number of trillions of cigarettes, y, purchased x years after 1960, is estimated by the linear equation y = .075x + 2.5.

(a) Draw the graph of this linear equation.

(b) What interpretation can be given to the y-intercept of the graph?

(c) When were there 4 trillion cigarettes sold?

(d) If this trend continues, how many cigarettes will be sold in the year 2024?

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