One aquarium is 12 inches long another is 15 inches long and a third is 18 inches long they are all 18 inches deep and 12 inches wide which aquarium can hold exactly 3240 cubic inches of water

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