For the satellite dish antenna shown below, the receiver is located at the focus of a parabolic cross section with its vertex being 3.6 feet directly below the focus. Which equation represents the parabolic cross section of the dish?

Astudent draws two parabolas both parabolas cross the x axis at (-4,0) and (6,0) the y intercept of the first parabolas is (0,-12). the y intercept of the second parabola is (0,-24) what is the positive difference between the a values for the two functions that describe the parabolas