Which expression represents the area of the storage facility in square feet? A. 5x + 6
B. 6x2 + 19.x - 7
C. 6x2 -7
D. 5x2 +6

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