II$.(10$ points$)$:

Determine the following:

a$)$ The total moment produced by force $F$ and moment $M_1$ about point $O($in cartesian from and as a magnitude$).$ Knowing that the magnitude of $M_1$ is $80$ lb $.$ft$.(5$ points$)$

b$)$ The magnitude of the moment produced the force $F$ only about axis $OA.$ Is the sense of this moment in the direction from $O$ to $A$ or $A$ to $O.(4$ points$)$

c$)$ What is the perpendicular distance between axis $OA$ and the line of action of force $F.(1$ point$)$