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Key Quiz 4.2
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1
Order the parabolas below without graphing from narrowest to widest:
a) y = 1/10x2 - 2
b) y = 5x2 - 1
c) y = -2/3x2 + 1/3
d) y = -3x2 + 10
e) y = x2 - 5
A)d, e, a, b, c
B)b, e, a, c, d
C)d, c, b, a, e
D)b, d, e, c, a
2
In the standard viewing window shown
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the graph of is shown as a dotted parabola and the graph of a relation of the form is shown as a solid parabola. Which of the following correctly categorizes the values of a and k?
A)a = 1/6
k = -3
B)a = -1
k = -3
C)a = -6
k = 3
D)a = -1/6
k = 3
3
In the standard viewing window shown
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the graph of is shown as a dotted parabola and the graph of a relation of the form y = x2 is shown as a solid parabola. Which of the following correctly categorize the values of a and k?
A)a = 4
k = 4
B)a = 4
k = -4
C)a = -4
k = -4
D)a =1/4
k = 4
4
The path of a swinging pendulum
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can be modelled by a relation of the form y = ax2 + k. This relation could be:
A)y = -1/3x2 + 2
B)y = -2x2 - 5
C)y = 1/3x + 2
D)y = 5x2 + 2
5
A skydiver jumps from a plane. Her height above the ground (in feet) can be modeled by the equation h(t) = -16t2 + 1600, where t is time in seconds. How long will it take her to reach the ground?
A)10 s
B)20 s
C)50 s
D)100 s





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