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A20-in satellite dish for a television has parabolic cross sections. Acoordinate system chosen so that the vertex of a cross section through the center of the dish is located at (0,0). The equation of the parabola is modeled by x2 = 25.2y, where x and y are measured in inches.
a. Where should the reciever be placed to maximize signal strength? That is , where is the focus?
b. Determine the equation of the directrix
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