Quadratic equations

I need to provide a quadratic equation that models the number of expected tickets sold each day x. (x=1 is the day tickets go one sale).

tickets=-0.2x^2+12x+11

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  1. It looks like you already have provided one such quadratic equation. Is there a set of data upon which you based that equation? Were 11 tickets sold before they went on sale?

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  2. This is the first step. I will need to answer a series of questions such as a. Does the grapgh of this equation open up or down? How did you determine this? So I will need to graph it.

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