please solve for slack A-G and explain the calculations

Roger Ginde is developing a program in supply chain management certification for managers. Ginde has listed a number of activities that must be completed before a training program of this nature could be conducted. The activities, immediate predecessors, and times appear in the accompanying table: Activity Immediate Predecessor(s) Time (days) A B C D E F G B AD E, F 4 6 3 10 3 5 10 This exercise contains only parts b, c, and d. b) The critical activities for the leadership training program development project are B-D-E-G c) The project length for the leadership training program development project 29 days d) Slack time for each of the activities is: Activity Slack Time