Factor this expression completely 9a 4 - b 2

Can someone pls ! pls answer all. no explanation needed..

How do your peer relationships affect your overall health status? what can you do to improve your peer relationships?

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