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?

Answer 1

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.

Answer 2

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)

Answer 3

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

Answer 4

Just be careful because for math they are different in most test

Answer 5

please be careful with only letter answers! they give different equations during quizzes!!

Answer 6

So are these the right answers or no

Answer 7

are you dumb they just said the test are different

Answer 8

d
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m
b

Answer 9

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

Answer 10

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a
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5
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7
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c
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Answer 11

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)

Answer 12

^^left some out. Figured by #7 you would know if it was the right test or not

Answer 13

I wish yall had the same test as me

Answer 14

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.

Answer 15

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)

Answer 16

These are the answers you provided for Part 1 of the Quadratic Relations and Conic Sections Unit Test.

Answer 17

im so mad #5 is different from what y’all have 💔

Answer 18

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.