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Mathematics 15 Online
OpenStudy (anonymous):

How can you tell if a parabola is opening up or down with only directix and focus?

OpenStudy (imstuck):

Oops made a mistake. Let me draw that again!

OpenStudy (imstuck):

|dw:1403998096494:dw|

OpenStudy (anonymous):

Thankssssssss

OpenStudy (imstuck):

|dw:1403998141589:dw|

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