Draw the influence lines for $($a$)$ shear and $($b$)$ the moment at C$.$ Use the

graphical approach, and find the magnitude using an equilibrium analysis. ALSO:

determine the value of the largest moment $($positive or negative$)$ caused by a

uniform distributed live load of $3$ k$/$ft applied over some region of the beam $($i$.$e$.$

draw the region$).$A

B