What do P(9) and P(12) represent in this problem

Find the value of the variable and the length of each secant segment.

We must first determine the shape of a rectangular prisms _ a0 to find area of the prism

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