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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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Step-by-step explanation:

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5 0
3 years ago
Explain how the GCF is used to factor an expression?
scoundrel [369]

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6 0
3 years ago
Please help me out! Thank you!
crimeas [40]

Answer:

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Answer:

Energy used, input

Monthly bill, output

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the bill is affected by how much energy u use

HOPE THIS HELPS!

Brainliest?

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