Marijuana Use The percent of U.S. high school seniors who used marijuana during 1990–2006 can be modeled by y = −0.0584x2 + 1.096x + 24.3657 percent, where x is the number of years after 1990.
a. What is the vertex of the graph of this model?
b. In what year does the model estimate that the use reached a maximum?
c. What is the maximum percent of usage, according to the model?
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