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Hi
T = -0.2x^2+12x+11 x is the # of days tickets have been on sale
and T is the number of Tickets expected to be sold on that day.
|parabola opens downward and completing the square...(-.2(x-30)^2 + 191)
tells us the Vertex is Pt(30,191)
For example: it is expected the most tickets will be sold on day 30.
