Ruth’s job at the Screen-P plant is to inspect flat-screen TVs for defects. She has 253 TVs to inspect today. Of the 46 she has inspected so far, only 2 have had defects. Assume the defect rate remains constant.

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