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Mathematics
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Explorations in College Algebra
Exam 8: Quadratics and the Mathematics of Motion
Path 4
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Question 101
Short Answer
A projectile is at a height
centimeters at time t = 0 seconds. Find the height at time t = 5 sec.
Question 102
Short Answer
A projectile is at a height
feet at time t = 0 seconds. At what time does the projectile reach the ground?
Question 103
Short Answer
Find the focus of a parabola represented by the equation
with vertex at (-1, -4).
Question 104
Short Answer
Find values for A and B using what you know about completing the square.
Question 105
Short Answer
Find the vertex of the parabola
Question 106
Short Answer
Find the coordinates of the vertex of the parabola given by .
Give your answer as a reduced fraction or whole number.
Question 107
Short Answer
The equation d = 16t
2
+ 12t describes the relationship between distance fallen, d, in ft, and time, t, in seconds, for a free falling object. What is the acceleration of gravity on the object?
Question 108
Multiple Choice
Select the choice which best describes the graph of .
Question 109
Essay
Transform the function
into a new function
by compressing
by a factor of 0.2, reflecting across the x-axis, and then shifting the result down 3 units. Find the equation of
Question 110
Short Answer
The antenna is placed at the focus of a satellite dish. If the satellite has a 6-inch diameter and is 0.54 inches deep, how many inches from the vertex of the satellite dish should the antenna be placed? Round your answer to 2 decimal places, if necessary.
Question 111
Short Answer
For the quadratic function pictured determine the equation of the axis of symmetry.
Question 112
Short Answer
Find any solutions to the equation
Write your answer as r
1
, r
2
, with r
1
2. For complex answers enter
.
Question 113
Short Answer
Find the x-coordinate of the vertex of the parabola given by .
Give your answer as a reduced fraction or whole number.
Question 114
Short Answer
A rancher has 2,800 feet of fencing. He wants to use all 2,800 feet to construct a rectangle with 2 interior separators that together form 3 rectangular pens. What are the dimension of the larger rectangle that give the maximum area? (Give both the length (L) and width (W).)
Question 115
Short Answer
The equation d = 490t
2
+ 26t describes the relationship between distance fallen, d, in cm, and time, t, in seconds, for a free falling object. What is the distance fallen by the object at time t = 6 sec?