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Mathematics 20 Online
psirockin2:

find an equation of a parabola with a vertex at the origin and directrix y=-2.5

Elsa213:

This might help: http://openstudy.com/updates/5324f8f5e4b06a39f8618338

psirockin2:

Can't see the diagrams or drawings they wrote...

psirockin2:

oh... nevermind thanks Elsa! It walks you through how to do it

Elsa213:

Ofc. :3

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