The radio telescope shown in the figure has the shape of a parabolic dish with a diameter

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The radio telescope shown in the figure has the shape of a parabolic dish with a diameter of 210 feet and a depth of 32 feet.image


(a) Determine an equation of the form y = ax2 with a > 0 describing a cross section of the dish. 


(b) The receiver is placed at the focus. How far from the vertex is the receiver located?

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