What is the equation of a line perpendicular to y=3x-2

Consider symmetrically placed rectangular insulators with uniformly charged distributions of equal magnitude as shown. x y −−−−−− what is the direction of the net field at the origin?

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

What effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.