A company must perform a maintenance project consisting of seven activities. The activities, their predecessors, and their respective time estimates are presented below: 
Using CPM, which activities have slack in this project?
Definitions:
Intellectual Organization
Refers to the way in which intellectual tasks and knowledge are structured, categorized, and accessed.
Libido
The psychological and emotional energy associated with the sexual drive.
Sigmund Freud
An Austrian neurologist known for founding psychoanalysis, a clinical method for treating psychopathology through dialogue between a patient and a psychoanalyst.
Maslow's Hierarchy
A theory in psychology proposed by Abraham Maslow that outlines a five-tier model of human needs, from basic physiological needs to self-actualization.
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