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OpenStudy (anonymous):
A parabola has its vertex at the origin and a directrix at y=4. Where is the focus located?
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jimthompson5910 (jim_thompson5910):
blank xy axis |dw:1437436785171:dw|
jimthompson5910 (jim_thompson5910):
|dw:1437436834898:dw|
jimthompson5910 (jim_thompson5910):
draw in the directrix y = 4 |dw:1437436852839:dw|
jimthompson5910 (jim_thompson5910):
`A parabola has its vertex at the origin` |dw:1437436941427:dw|
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