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Mathematics 14 Online
OpenStudy (anonymous):

he number of tickets sold for a concert event can be modeled by y= -x^2/8+x+1, where x is the time in hours since the tickets have begun to sell, and y is the number of tickets sold per hour. For how long will tickets be sold? A. 6.71 hours C. 8.90 hours B. 8.12 hours D. 11.05 hours

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