Can someone ! : c you in advance!

4. find the geometric mean of 4 and 12. 24 8

What adds to be the bottom number but also multiplies to be the top number with 8 on the bottom and 15 on top

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