1. Opener X Y 25 5 26 10 27 20 29 50 35
A cell phone company's plan rate is shown below.
What does the y-intercept represent?
Cost (dollars)
Usage (minutes)

2. Opener X Y 25 5 26 10 27 20 29 50 35
A cell phone company's plan rate is shown below.
What does the y-intercept represent?
This must be the monthly
charge since no minutes
have been used yet.
Cost (dollars)
Usage (minutes)

3. (2x+6)(x+3)
2 𝑥 2 +6𝑥+6𝑥+18
The area of the park is represented by 
the expression 2 𝑥 2 +12𝑥+18 yd2.

4. 2 𝑥 2 +6𝑥+6𝑥+18
(or their answer from #1) +
3 𝑥 2 +11𝑥 −2
5 𝑥 2 +23𝑥+16 yd2

5. Essential Question Learning Objective
What are the key features of quadratic 
functions?
Given a graph and table, I will identify 
key features of the quadratic situation and interpret them in context.

7. ax2+bx+c Key Features of Quadratic Functions
you should know:
2 key features of quadratic functions
be able to ID them on graph and table
interpret them in terms of a context

8. Key Terms: Intercepts - where a function crosses (intercepts) an axis.
For quadratic functions, the x-intercepts are the
most important.

9. Key Terms: Intercepts - where a function crosses (intercepts) an axis.
For quadratic functions, the x-intercepts are the
most important.
x-intercepts

10. Key Terms:
Vertex - the minimum or maximum point of a quadratic function.
(the "tip" of the curve)

11. Key Terms:
Vertex - the minimum or maximum point of a quadratic function.
(the "tip" of the curve)
Vertex

12. Diving for Food
The path a seagull takes as it dives for food can be modeled with a quadratic function. X Y 2 8 4 5 -1 6
Height (feet)
Time (seconds)

14. time
(seconds)
height
(feet)

15. time
(seconds)
height
(feet)

16. time
(seconds)
height
(feet)

17. time
(seconds)
height
(feet)

18. time
(seconds)
height
(feet)

19. "Your Turn"

26. "WE DO" 
TIME

27. Problem distance (ft) The parabola represents a
crater in the Earth's crust.
If y = 0 represents the level
Earth surface, approximately
what is the diameter of the
edge of the crater?
How deep does the crater
reach?
height (ft)
distance (ft)

28. Essential Question Learning Objective
What are the key features of quadratic 
functions?
Given a graph and table, I will identify 
key features of the quadratic situation and interpret them in context.

29. Closure
Which one is incorrect & why? Then give the correct info.
#1 The x-intercept is (0,8)
#2 The vertex is (6,0) x y -7
-13
-5.1 4 8
-2.1
12.9
1.7 3

30. Begin Quadratics Task 1 in Projects TabHW
Math II
Begin Quadratics Task 1 in Projects Tab

31. real life situations using parabolas:
antennas
projectiles
cannon balls
bouncing balls
catapults
potato shooters
pumpkin tosses
kicked balls
craters
bridge arches

34. time
(seconds)
height
(feet)

36. distance (tens of feet)
height (feet)