4500 4000 + Cigarette Consumption :: The number of cigarettes 3500 consumed by adults over the age of 18 in the United States, c, is a function of the years since 1990, t, and is 2500 - 3000 + given in the following graph. 2000 + 1500 + 1000 500 + +++++++> 10 20 30 40 50 60 70 80 90 100 Years Since 1900 Cigarettes Per Capita

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