Help please!!!

For each of the problems listed, determine the following quantities for each activity: the earliest start time, latest start time, earliest finish time, latest finish time, and slack time. List the critical activities, and determine the expected duration of the project. a. Activity-on-arrow diagram ES EF LS LF Slack Summary: Activity 1-2 13 2-4 2-5 4-7 co 5-8 6-9 7-10 8-10 9-11 10-12 11-12 7-10 8-10 9-11 10-12 11-12 The critical path is The expected project duration is b. Activity-on-node diagram 18 b Activity-on-node diagram 19 10 O 1 13 Summary: Activity ES EF LS LF Slack 2 3 4 5 6 7 8 9 Summary: Activity ES EF LS LF Slack 4 5 6 7 8 9 The critical path is The expected project duration is 1-2-4-6-8-9 1-2-5-7-8-9 1-3-7-8-9