Lisa made a shirt using 1/3 m of blue fabric and 3/5 m of red fabric how many meters of fabric did she use in all
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As the directrix is parallel to x-axis, the concavity of the parabola will be in vertical. Then, the general equation is in the form: 
, where 
are the coordinates of the vertice and p is the parameter (distance between the focus and the directrix). The parameter is 
. The vertice is the midpoint between the focus and the projection of the focus in the directrix. Then, the vertice is 
. Hence, the parabola is: 
Now, derivating:
