The graph shows the consumption of cigarettes (in billions) in the United States for selected years. (Source: www.cdc.gov) The x variable represents the number of years since 1990 and the y variable represents the number of cigarettes consumed in billions.
a. Use the points (4,486) and (13,400) to write a linear model for these data. (Round the slope to 2 decimal places and round the y-intercept to the nearest whole unit.)
b. Interpret the meaning of the slope in the context of this problem.
c. Interpret the meaning of the y-intercept in the context of this problem.
d. In the event that the linear trend continues beyond the last observed data point, use the model in part (a) to predict the number of cigarettes consumed in the United States for the year 2015.

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