The circle below represents a whole, or 1.use subtraction to determine the unknown part of the circle. the unknown part of the circle is? 3/10 and 10/20

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