A closed surface with dimensions a = 0.400m, b = 0.400m, and c = 0.600m is shown above. The left edge of the closed surface is located at the point a. The electric field through the region is nonuniform and is given by E = (3.00 + 2.00x^2)i N/C, where x is in meters.
(a): Calculate the electric flux through the closed surface.
(b): What is the net charge enclosed by the surface?