Wich relation is a function of x

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.

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

The functions f(x) and g(x) are shown in the graph f(x)=x^2 what is g(x) ?