Cigarette Use For the period 1997–2009, the percent y of students in grade 12 who used cigarettes can be modeled by 2.1x + y = 82.1, where x is the number of years after 1990.
a. Solve the equation for x to represent the number of years after 1990 as a function of the percent.
b. Use the equation from part (a) to determine the range of percent of cigarette use for the years 2000 to 2009.
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