What are the two ways you could write a constant of proportionality equation?

Collin did the work to see if 10 is a solution to the equation r/4=2.4

What is the radius of the cone in the diagram? round your answer to the nearest whole number

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