Which of the following statements are true? check all that apply

Henry is an avid reader, he devours 90 pages in half an hour how many pages has henry read per minute?

What is the gcf of 20c^3-5c^4+30c^6

Astudent draws two parabolas both parabolas cross the x axis at (-4,0) and (6,0) the y intercept of the first parabolas 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