Please help, I have redone this problem a million times and i cant get it right. Time sensitive!!

How can you decide witch operations to use to slice a two step equation

    choose the correct definition for  extremo.  a.  end      b.  extra      c.  extract      d.  eventual 

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