Use the table below to determine whether​ f(x) could represent a linear function. If it​ could, write​ f(x) in the form ​f(x)=mx+b. (TABLE IS ON ATTACHED SCREENSHOT FILE)
Select the correct choice and, if necessary, fill in the answer blank in your choice below.
A. The values could represent the linear function f(x)=___.
B. The function is not linear.

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