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OpenStudy (anonymous):
a satelite dish has a diameter of 8 feet and a focal length of 5 feet. what is the equation of the cross-section parabola?
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OpenStudy (campbell_st):
Well the vertex will be at the origin, so the standard form is \[x^2 = 4ay\] a = the focal length so \[x^2 = 20y\] or \[y = \frac{1}{20} x^2\]
OpenStudy (campbell_st):
it looks like |dw:1411361605526:dw|
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