Kevin makes a list of the tasks he has to do after school and how long it will take him to do each task.

How long will it take Kevin to complete all of his tasks?
9/12

B
9/15

C
27/12

D
20/12

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