SOLUTION: Based on information provided by the US Institute on Drug Abuse, the percent y of 18 to 25 year olds who had used hallucinogens between 1974 and 1991 can me modeled by the function

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Question 391347: Based on information provided by the US Institute on Drug Abuse, the percent y of 18 to 25 year olds who had used hallucinogens between 1974 and 1991 can me modeled by the function y= .025x^3-.7x^2+4.43x+16.77, where x=0 corresponds to the year 1974. In what year did the type of drug reach its minimum?
Answer by stanbon(75887) About Me  (Show Source):
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Based on information provided by the US Institute on Drug Abuse, the percent y of 18 to 25 year olds who had used hallucinogens between 1974 and 1991 can me modeled by the function y= .025x^3-.7x^2+4.43x+16.77, where x=0 corresponds to the year 1974. In what year did the type of drug reach its minimum?
y= .025x^3-.7x^2+4.43x+16.77
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graph%28400%2C300%2C-10%2C20%2C-10%2C20%2C0.025x%5E3-0.7x%5E2%2B4.43x%2B16.77%29
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Ans: Mimlmum occurs at x = 14.629
Minimum occurs in 1974+14.629 in 1989
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Cheers,
Stan H.
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