Please help by writing step by step, I am preparing for finals.

l. A student wants to use CPM to analyze the schedule: Immediate Activity Predecessor Duration (day) a - 3 b a 4 c a 5 d - 3 e =d 6 f m 7 a) Show all potential paths and their durations. b) What is the critical path? c) How long is the project duration? d) If activity \"a\" does not start until the second day (delayed by one day), what is your new estimate on total project duration? e) If activity "e\" does not finish until day 10 (delayed by one day), what is your new estimate on total project duration? 2. Consider a project having the following seven activities: Normal Normal Crash Crash Maximum Immediate Time Cost Time Cost Weeks Activity Predecessors (weeks) =5) (weeks) (S) Reduced A none 4 3,000 3 5,000 1 B =A 9 5,000 7 8,000 2 C =A 4 7,000 4 7,000 0 D B, C 6 6,000 4 8,000 2 E =C 8 4,000 6 8,000 2 F =D 3 4,000 2 9,000 1 G E, F 4 2,000 2 7,000 2 a) What is the expected project completion time? b) What is the most economical way and how much will it cost to reduce the completion time of the project by three weeks