How many gallons of gasoline that’s 6 percent ethanol must be added to 2,000 gallons of gasoline with no ethanol to get a mixture that’s 4 percent ethanol?

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