A laboratory designed a radio telescope that had a diameter of 280 ft and maximum depth of 46 ft a Write an equation of a parabola that models the cross section of the dish if the vertex is placed at the origin and the parabola opens up b The receiver must be placed at the focus of the parabola How far from the vertex should the receiver be located a The equation of the parabola is Simplify your answer Use integers or fractions for any numbers in the equation b The receiver should be located at approximately ft above the vertex Type an integer or decimal rounded to the nearest tenth as needed 53