(a)
To sketch: The graph for two options for the dish one that opens up and one that opens left.
(a)
Answer to Problem 33PPS
The graphs of the dish that opens up and one that opens left are shown in figure (1) and (2).
Explanation of Solution
Given:
The diameter of the dish is 146 feet.
The focus is 48 feet from the vertex.
Calculation:
Assume that the vertex of the parabola is at origin
The sketch of the dish opening up is as follows.
Figure (1)
The sketch of the dish opening left is as follows.
Figure (2)
Therefore, the graphs of the dish that opens up and one that opens left are shown in figure (1) and (2).
(b)
To write: The two equations that model the sketches in previous part.
(b)
Answer to Problem 33PPS
The equations are
Explanation of Solution
Given:
The diameter of the dish is 146 feet.
The focus is 48 feet from the vertex.
Calculation:
Assume that the vertex of the parabola is at origin
The distance between focus and vertex is equal to 48 feet. Then
The parabola opening up will be of the form
Substitute
The parabola opening left will be of the form
Substitute
Therefore, the equations are
(c)
To find: Whether it is matter to find the equation that must be used to find the depth of the dish.
(c)
Answer to Problem 33PPS
No, it does not matter which equation is used to find the depth of the dish.
Explanation of Solution
Given:
The diameter of the dish is 146 feet.
The focus is 48 feet from the vertex.
Calculation:
Two graphs are identical in all respect except for the direction in which they open.
Therefore, no, it does not matter which equation is used to find the depth of the dish.
Chapter 10 Solutions
Algebra 2
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