Step-by-step explanation:
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If we put the parabola in a coordinate system with vertex at the origin and facing the positive x axis. We have the following points lying on the curve:
(4, 8), (4, -8)
For parabola facing right:
y2 = 4ax
Substituting either coordinates to solve for a:
a = 4
Therefore, the microphone should be placed 4 inches from the bottom of the disk.
My best guess is to go with C, sorry if its wrong!
edit: just realized this said red and blue, my bad!