High School Smokers The percent of high school students who smoked cigarettes on 1 or more of the 30 days preceding the Youth Risk Behavior Survey can be modeled by y = −0.061x2 + 0.275x + 33.698, where x is the number of years after 1990. In what year does this model predict the value of y to be negative, making it certain that the model is no longer valid?
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