The table shows the educational attainment of the population of​ Mars, ages 25 and​ over, expressed in millions. Find the probability that a randomly selected​ martian, aged 25 and over has not completed four years​ (or more) of college.

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