A company must perform a maintenance project consisting of seven activities. The activities, their predecessors, and their respective time estimates are presented here: 
Using CPM, which activities have slack in this project?
Definitions:
Living Will
A document that indicates what medical intervention an individual prefers if he or she is not conscious when a decision is to be expressed. For example, some do not want mechanical breathing.
Revive
To bring back to life or consciousness; to reinvigorate or rejuvenate something that has declined or become dormant.
Active Euthanasia
The intentional act of causing the immediate death of a patient suffering from an incurable and painful disease or condition at their request or consent.
Respirator
A device designed to protect the wearer from inhaling harmful substances or to assist in the breathing process.
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