The compound beam is given in a$),$

Draw the FBD of the EC; Draw the FBD of the DBE; Draw the FBD of the AD; Draw

the FBD of the whole structure for case a$)$ below;

Solve reactions at C$,$ B$,$ and A$.$

Hint: Start with the dependent part, EC first, then the second dependent, DBE, last the

independent part AD $.$