write the descriptions from fastest unit rate to slowest unit rate 1/2 mile in 1/3 hour 4/5 mile in 1/4 hour 7/4 mile in 2/5 hour 1/4 mile in 1/10 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