Can anyone help me with number 1? If you want to you can do all 3

Astudent draws two parabolas on graph paper. both parabolas cross the x-axis at (-4, 0) and (6,0). the y-intercept of thefirst parabola is (0, –12). the y-intercept of the second parabola is (0-24). what is the positive difference between the avalues for the two functions that describe the parabolas? write your answer as a decimal rounded to the nearest tenth.

What is x3+3x2−16x−48 divided by x−1?

Can you me find the missing length. i attached an image.