What is the midpoint of a line segment with the endpoints (8, -3) and (-5, -9)?
(-7, 2.5)
(2.5, -7)
(-6, 1.5)
(1.5, -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