Explain this concept.

9.1 Define the following terms:
Path
Activity
Early start
Early finish
Late start
Late finish
Forward pass
Backward pass
Node
AON
Float or Slack
Critical path
PERT
9.8 What is the time estimate of an activity in which the optimistic estimate is 4 days, pessimistic is 12 days, and most likely is 5 days? Show your work.
9.10 Attached
10.2 The advantage of Gantt charts lies in their linkage to the project schedule baseline. Explain this concept.
10.10 attached
11.5 What are the advantages and disadvantages of Agile PM?
11.16 attached