The reflecting dish of a parabolic microphone has a cross-section in the shape of a parabola. the microphone itself is placed on the focus of the parabola. if the parabola is 24 inches wide and 9 inches deep, how far from the vertex should the microphone be placed?
1. B. ellipse
Domain: {–4 ≤ x ≤ 4}
Range: {–3 ≤ y ≤ 3}
2. B. y= x²/4
3. D. y = 1/6x²
4. D. 4 inches
5. D. x = 1/12(y – 4)2 + 2
6. B. (x – 4)² + (y – 5)² = 49
7. (x + 7)² + (y + 2)² = 25
8.D. (x + 3)² + (y + 2)² = 9
9. B. Center at (5,-3); radius: 5
10. D. x²/23 + y²/144 = 1
11. A. (0, ±6)
12. C. 10 feet
13. A. (6,0) and (-6,0)
14. A. (0, ± 5)
let the parabola have the form y^2 = 4px, where (p,0) is the focus
the point (9,12) would lie on this curve, so
144 = 4p(9)
4p = 144/9 = 16
p = 4 , focus is (4,0)
So the microphone should be placed 4 inches from the vertex.
dont trust only letter answers. if you see a written out answer that has the same question number on your test, and matches an available answer to that question, it's the correct one. for answers you dont get from here, just look up the questions individually
please be careful with only letter answers! they give different equations during quizzes!!
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Just be careful because for math they are different in most test
So are these the right answers or no
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^^left some out. Figured by #7 you would know if it was the right test or not
I wish yall had the same test as me
Quadratic Relations and Conic Sections Unit Test Part 1
1. B. Ellipse
Domain:{ -4<=y<=4}
Range:{-3<=y<=3}
2. C. y= x^2/3
3. C. y=1/10x^2
4. D. 4 inches
5. D. x= 1/12 (y-4)^2+2
6. D. (x-2)^2+(y-4)^2=25
7. C. (x+6)^2+(y+3)^2=25
8. D. (x+3)^2+(y+2)^2=9
9. A. center at (7,-6); radius 4
10. B. x^2/25+y^2/169=1
11. C. (0,=+3)
12. C. 10 feet
13. C. (the graph description: the left parabola opens left. the right parabola opens right)(the center point of each parabola is left- (-3,0) right-(3,0)
14. D. (0,=+5)
These are the answers you provided for Part 1 of the Quadratic Relations and Conic Sections Unit Test.
im so mad #5 is different from what y’all have 💔
I apologize for any confusion or frustration this may have caused. It's important to remember that answers can vary between tests or exams depending on who is administering them. It's always a good idea to carefully review the material and understand the concepts in order to perform well on any math exam.
are you dumb they just said the test are different
Answers to 5.7.1 - Test - PConnexus
1. C, Ellipse
2. D, graph
3. B, y=1/4 x^2
4. C, 9in
5. D, x=1/12(y-4)^2+2
6. D, (x-2)^2 + (y-4)^2 =25
7. B,
8. C
9. A
10. B
11. A
12. C
13. C, graph
14. D, (0,+5)
I'm sorry about that, the answers can vary between tests or exams depending on who is administering them. It's important to review the material thoroughly and understand the concepts in order to perform well on any math exam.
1.B
2.B
3.D
4.D
5.C
6.A
7.A
8.D
9.B
10.D
11.A
12.D
13.A
14.A
100/100