If Torrie buys 8 jars of jiffy peanut butter for 27.12 or 7 jars of peter pan peanut butter for 26.53 what is the difference in the unit rates of the jars of peanut butter?

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