Hello. Here is a problem similar to one I am having trouble solving. If I could get help solving this problem, I would be able to solve my actual problem...

The number of tickets sold each day for an upcoming performance of Handel’s Messiah is given by N(x)=-0.4x²+9x+11, where x is the expected number of ticket sales per day. x=1, the day tickets go on sale. After how many days will the peak or low occur? How many tickets will be sold that day? In addition how do I find the last day tickets will be sold? And how do I find the point of vertex for this function? How does this number relate to the questions "after how many days will the peak or low occur and how many tickets will be sold that day?" Furthermore, how many solutions will the function have? Is there a solution that does not make sense. If so, what ways will it not make sense?

I do not know how to find the peak day and low days or anything like that. I really need some assistance.

Regards,

Angela Ainsworth