PLEASE HELP, WILL MARK BRAINLIEST! Find the coordinates of the centroid of the triangle with the vertices at S(-2, 3), T(6, 7), and U(4, 1)

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