Please help with these

A positive charge 1 nC is located on the origin of a graph. A negative charge of -1 nC is located two meters to the right of the first charge. The net electric field at a point midway between them (in N/C) would be?

Two points A and B are separated by 2.0 meters along the x-axis. Point A is located at the origin and has a potential of 36.0 V. If a uniform electric field is pointing along the negative x-direction between the two points and has a magnitude of 20 N/C, what is the potential at point B