hi need help on this

Problem 5.4 (20 points) 8000 1b 4000 1b 5000 1b For the truss in Figure 5.5, determine the B D E F force in members EI, IJ and DJ. A O O G 12 ft O O L H - -9 ft--- 9 ft- 9 ft- -9 ft- 9 ft- -9 ft- Figure 5.5