four forces act on a point 2N.2N.2N.4N determine the equilibrant of the four forces

Answer 1

Forces are vectors.
They have magnitudes and directions.
You gave the magnitudes.
You did not give the directions.
Therefore the resultant has a magnitude somewhere between 2 and 10 N and some direction.
Without knowing the resultant vector, I am powerless to come up with an opposite vector equal in magnitude.