Acyclist rode at an average speed of 15 mph for 30 miles. how long was the ride? question 6 options: 0.5 hours 1 hour 2 hours 3 hours

Astudent draws two parabolas on graph paper. both parabolas cross the x-axis at (–4, 0) and (6, 0). the y-intercept of the first parabola 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? write your answer as a decimal rounded to the nearest tenth