Urgent answer two forces each 4n act on the opposite side of a 0.4m square plate. calculate the resultant force and couple acting on the plate

1) Resultant force:
The two forces have same magnitude (4 N) but opposite verse, so their resultant is zero:


2) Couple
The two forces have opposite direction and they are applied at a distance d=0.2 m from the center of the square, so they generate a couple equal to the sum of the torques generated by each force:

Lx bxh