A uniform electric field exists everywere in the x, y plane. This electric field has a magnitude of 4500 N/C and is directed in the positive x direction. A point charge -8.0 x 10^-9C is placed at the origin. Determine the magnitude of the net electric field at (a.) X= -0.15 m, (b.) X= +0.15 m, and (c.) y= +0.15 m.