1. The problem statement, all variables and given/known data Replace the force and couple system shown by an equivalent resultant force and couple moment acting at point O. The solution being: I understand the force summation, but I'm a bit confused about the direction for the moment summation. 3. The attempt at a solution I don't know how they determined which components had positive or negative moments. The x components on the two forces are in the same direction, but the moment of force is positive for one and negative for the other. I thought it would have been: (3kN)sin(30)(0.2m) - (3kN)cos(30)(0.1) - (3/5)(5 kN)(0.1m) - (4/5)(5 kN)(0.5m) - (4kN)(0.2m) Thank you.