Please help! All I have is 12 points to give :(

A. Write an expression to represent the difference between the two points shown on the number line.

B. Find the distance between the two points. [Hint: Remember that distance is always positive.]

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