2. # in group
Cost per person
Total $
 16
 20
 24
 28
 32 36
 40
 44
 48
 50
 52
 56
 60

3. # in group
Cost per person $
Total $
 16
 42
 (42)(16)= 672
 20
 40
 24
 38
 28
 36
 32
 34 36
 30
 44
 48
 26
 50
 25
 52
 56
 22
 60

4. Make a graph of your data.
Put Total Cost on the y-axis
Put # of people on the x-axis
Answer the following questions:

6. 50
$1250
$800
It’s free!
After 100 people the park pays you to come in!
This does not make good sense.
It is best to give a discount up to the maximum
(optimum value)

8. Introducing… The Parabola!
The graph of a quadratic relation is called a parabola.
The parabola has some important features:
________
___________
_______________
_____
_________________

9. Introducing… The Parabola!
The graph of a quadratic relation is called a parabola.
The parabola has some important features:
________
____
___vertex_____
_axis of symmetry___
_____
Optimal Value

10. Introducing… The Parabola!
The graph of a quadratic relation is called a parabola.
The parabola has some important features:
_zero___
__y - intercept__
___vertex_____
___zero_
_axis of symmetry___
_____
Optimal Value

11. Everything you ever wanted to know about parabolas…
Parabolas can open up or down
The zero of a parabola is where the graph crosses the x – axis
“Zeroes” can also be called “x – intercepts” or “roots”
The axis of symmetry divides the parabola into two equal halves
The vertex of a parabola is the point where the axis of symmetry and the parabola meet. It is the point where the parabola is at its maximum or minimum value.
The optimal value is the value of the y co-ordinate of the vertex
The y-intercept of a parabola is where the graph crosses the y – axis