Algebra

x=1 is the day tickets go on sale.
Tickets=-0.2x^2+12x+11

use the quadratic equation to determine the last day that tickets will be sole. (Write your answer in terms of the number of days after ticket sales begin)

MY ANSWER: 60 days

Stuck on this portion:
will tickets peak or be at a low during the middle of the sale and how do you know?

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