Andrei has a glass tank that he would like to fill with marbles and water.
W(m) models the amount of water Andrei needs (in liters) if he uses m marbles.
m 10 32 68
W(m) 36.5 28.8 16.2
When does the necessary amount of water decrease faster?

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