Question 175899: 1. You need to supply information about projected ticket sales to the box office manager. The box office manager uses this information to anticipate staffing needs until the tickets sell out. You provide the manager with a quadratic equation that models the expected number of ticket sales for each day x. ( x=1 is the day tickets go on sale).
tickets= -0.2x^2 + 12x + 11
a. Does the graph of this equation open up or down? How did you determine this?
b. Describe what happens to the tickets sales as time passes?
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.)
d. Will tickets peak or be at a low during the middle of the sale? How do you know?
They will peak in the middle of sales because the graph opens down.
e. After how many days will the peak or low occur?
f. How many tickets will be sold on the day when the peak or low occurs?
g. What is the point of the vertex? How does this number relate to your answers in parts e and f?
(0,11)
h. How many solutions are there to the equation ? How do you know?
i. What do the solutions represent? Is there a solution that does not make sense? If so, in what ways does the solution not make sense?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! You provide the manager with a quadratic equation that models the expected number of ticket sales for each day x. ( x=1 is the day tickets go on sale).
tickets= -0.2x^2 + 12x + 11
a. Does the graph of this equation open up or down? How did you determine this?
Down; the negative on the x^2 term
----------------------------------------------
b. Describe what happens to the tickets sales as time passes?
They decrease.
---------------------
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.)
-0.2x^2 + 12x + 11 =0
x = [-12 +- sqrt(144- 4*-0.2*11)]/[-0.4]
x = [-12 +- sqrt(152.8)]/[-0.4]
x = [-12 +- 12.36]/[-0.4]
x = 60.9
-----------------------------------
d. Will tickets peak or be at a low during the middle of the sale? How do you know?
They will peak in the middle of sales because the graph opens down.
-----------
e. After how many days will the peak or low occur?
x = -b/2a = -12/[-0.4] = 30
----------------------------------------
f. How many tickets will be sold on the day when the peak or low occurs?
Find f(30)
-----------------------------------
g. What is the point of the vertex? How does this number relate to your answers in parts e and f?
(30,f(3))
--------------------------
h. How many solutions are there to the equation ? How do you know?
2, it's a quadratic
--------------------------------
i. What do the solutions represent? Is there a solution that does not make sense? If so, in what ways does the solution not make sense?
I'll leave that to you.
If it's negative, it doesn't make sense.
================================================
Cheers,
Stan H.
|
|
|
