A solar oven uses a parabolic reflector to focus the sun's rays at a point 5 inches from the vertex of the reflector (see figure). Write an equation for a cross section of the oven's reflector with its focus on the positive y axis and its vertex at the origin.
L = 5 inches
A. 
B. 
C. 
D. 
E. ?
Answer: D
Mathematics
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