In a lab, 100 cells are present at the beginning of an experiment. During the first 10 hours, the number of cells increased by 28% each hour.

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