Which color of sugar has a proportional relationship with the number of cookies decorated? 12 cookies 1 1/4 tsp, 24 cookies 2 3/4 tsp

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