Solve. Please include a graph (or sketch) with each. 1. A pizza delivery area can be represented by a circle, and extends to the points (0,18) and (-6,8) (these points are on the diameter of this circle). Write an equation for the circle that models this delivery area. 2. A searchlight has a parabolic reflector (has a cross section that forms a "bowl"). The parabolic "bowl" is 16 inches wide from rim to rim and 12 inches deep. The filament of the light bulb is located at the focus. (a) What is the equation of the parabola used for the reflector? (b) How far from the vertex is the filament of the light bulb? 3. The cables of the middle part of a suspension bridge are in the form of a parabola, and the towers supporting the cable are 600 feet apart and 100 feet high. What is the height of the cable at a point 150 feet from the center of the bridge