The U.S. Department of Health conducted a survey for the years 1985–2008 regarding the use of cigarettes. Data from those years indicate that the linear function
y = 20.47x + 47.1
gives an estimate of the 18–25 age group using cigarettes. The variable x represents the number of years since 1985 (x = 0 for 1985) and y represents the percentage using cigarettes.
(a) Estimate the percentage using cigarettes in 2005, 2015, and 2025.
(b) When does y reach 20?
(c) What does your answer in part (b) mean?
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