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. 9.13 Referring to the figure in Problem 9.12 |0, 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