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Anna71 [15]
2 years ago
10

2.

Mathematics
1 answer:
AleksandrR [38]2 years ago
7 0

Answer:

Step-by-step explanation:

Assume the dish opens upwards. The cross-section through the vertex is a parabola. You know three points on the parabola: (0,0), (2,2), and (-2,2). Plug the points into y = ax² + bx + c to get a system of three equations where a=0.5, b=c=0.

Equation of parabola: y = 0.5x²

:::::

Vertex (0,0)

Focal length = 1/(4×0.5) = 0.5

Focus (0,0+0.5) = (0, 0.5)

Directrix y = 0-0.5 = -0.5

:::::

At endpoints of latus rectum, y = 0.5

x = ±√0.5 = ±√2/2

Focal width = 2×√2/2 = √2

:::::

Place antenna at focus, (9,2)

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1) Find x, if 1/3 of x is 14
BartSMP [9]

"of" means multiply      and         "is" means equal

1. \frac{1}{3}x = 14

                                x = 14(3)      <em>multiply both sides by 3 to isolate "x"</em>

                                x = 42

2. \frac{1}{5}x = 14

                                x = 14(5)      <em>multiply both sides by 5 to isolate "x"</em>

                                x = 70

3. \frac{2}{5}x = 14

                                2x = 14(5)      <em>multiply both sides by 5 </em>

                                2x = 70

                                  x = 35         <em>divide both sides by 2 to isolate "x"</em>

4. \frac{7}{8}x = 14

                                7x = 14(8)      <em>multiply both sides by 8 </em>

                                7x = 112

                                  x = 16         <em>divide both sides by 7 to isolate "x"</em>

Answers: 42, 70, 35, 16

5 0
2 years ago
<img src="https://tex.z-dn.net/?f=%5Cfrac%7B6%7D%7B15%7D" id="TexFormula1" title="\frac{6}{15}" alt="\frac{6}{15}" align="absmid
aleksklad [387]
So what you do,is you add them together to get 13/10 but then you can also simplify it but you can keep the answer to 13/10
3 0
2 years ago
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What is blank divided by 9 equals 5
Rudik [331]

Answer:

45 divided by 9 equals 5

Step-by-step explanation:

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3 years ago
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Help meh plzzzzzzzz Quick
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ggs bad anwser

3 0
2 years ago
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Blake solved the following division exercise : 136 divided by 3 = 44 R4. Explain how you know the answer is wrong just by lookin
son4ous [18]
The remainder (which is what Blake says is the remainder), can never be more than the number you are dividing by (the dividend), which in this problem is three.

Divide 136 by 3 and you will prove that answer is incorrect.
3 0
3 years ago
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