9.12 You have a partial network for your project, and you are about to conduct a forward pass through it. Explain why the early start (ES) for activity G is 23 days, not 19 days. Remember, activity G is a merge activity. 16 E 23 7 G 4 14 F 19 5 9.13 Referring to the figure in Problem 9.12 g, suppose that Activity G was the last activity in the network and you were about to start a backward pass. a. What is the project's duration? (Hint: complete the forward pass) b. What are the late finish (LF) and late start (LS) values for activities E, F, and G? c. Which activity has slack time? How many days? 9.15 Your university is holding a fund-raiser and will be hiring a band to entertain spectators. You have been selected to serve as the event project manager and have created a Work Breakdown Structure and duration estimates for the activities involved in site preparation for the event. Construct a network activity diagram based on the following information: Activity Description Predecessors Duration (Days) A Site selection None 4 B Buy concessions A 4 Rent facilities 2 D Build stands A 5 E Generator & wiring installation 2 F Security B 4 G Lighting installation E 2 H Sound system installation E, F 2 1 Stage construction D 3 J Tear down G, H, 1 a. Conduct both a forward and backward pass using AON notation. What is the estimated total duration for the project? b. Identify all paths through the network. Which is the critical path? c. Which activities have slack time? d. Identify all burst activities and merge activities