Consider the dependency matrix and the activity durations provided below. The 'X' symbol in a cell indicates that the activity in that row cannot start until the activity in that column has been completed. For example: Acivity 1 must finish before either Acivity 2 or Activity 3 can start, and both Activity 4 and Activity 9 must finish before Activity 10 can start.

1 X X 2 3 X X 5 X 8 1 2 3 4 5 6 7 8 9 X X 10 X Activity 1 2 3 4 5 6 7 8 9 Time 13 12 16 13 1 20 12 15 14 X 6 7 X 10 2 9 X For each activity, compute the slack time. Duration Slack time A1 13 A2 12 A3 16 A4 13 A5 1 A6 20 A7 A8 A9 A10 12 15 14 2