<PRE><B>Question 255930</B>
Tickets=-0.2x^2+12x+11 
a. Does the graph of this equation open up or down? How did you determine this? 
{{{graph(400,300,-10,65,-10,200,-0.2x^2+12x+11)}}}
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b. Describe what happens to the tickets sales as time passes?
They rise then fall.
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c. Use the quadratic equation to determine the last day that tickets will be sold. (Note: Write your answer in terms of the number of days after ticket sales begin.)
Solve: -0.2x^2+12x+11 = 0
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d. Will tickets peak or be at a low during the middle of the sale? How do you know?
Peak
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e. After how many days will the peak or low occur?
Find x = -b/2a
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f. How many tickets will be sold on the day when the peak or low occurs?
Find f(-b/2a)
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g. What is the point of the vertex? How does this number relate to your answers in parts e and f?
They are the x and y values of the vertex
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h. How many solutions are there to the equation ? How do you know?
Two. 

i. What do the solutions represent?
zero ticket sames
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 Is there a solution that does not make sense? 
The negative value solution
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If so, in what ways does the solution not make sense?
It points out a day before ticket sales started.
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Cheers,
Stan H. 

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