Suppose that cigarette sales in the United States between 1910 and 2010 are described by the equation
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Suppose that cigarette sales in the United States between 1910 and 2010 are described by the equation S = 130 + 18t − 0.12t2, where S is total sales (in billions) and t = 0 in 1910, t = 1 in 1911, and so on.
a. Are sales increasing or decreasing in 1910?
b. Does the annual increase in sales rise or fall as time passes?
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Related Book For 
Essential Statistics Regression And Econometrics
ISBN: 9780123822215
1st Edition
Authors: Gary Smith
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