1. A cross section of a large parabolic satellite dish is modeled by y = x2 / 200, 100 ¤ x ¤ 100 (see figure).

1. A cross section of a large parabolic satellite dish is modeled by y = x2 / 200, ˆ’100 ‰¤ x ‰¤ 100 (see figure). The receiving and transmitting equipment is positioned at the focus. Find the coordinates of the focus.

2. Each cable of a suspension bridge is suspended (in the shape of a parabola) between two towers (see figure).

(a) Find the coordinates of the focus.
(b) Write an equation that models the cables.

150 - 200 100 Focus 50 100 -100 -50 30 (-60, 20) (60, 20) 20 10 -60 -40 -20 40 60 -10