4. A project has the following activities, times, and precedence relationships: Preceding Activity Time (Weeks) Activities A 15 none B 5 none C 21 A D 9C E 12 C F 7 D, E, B

a. Draw a precedence diagram for the project.

b. Compute the earliest start times, earliest finish times, latest start times, latest finish times, and slack times. Write these values in the precedence diagram.

c. Determine the critical path.

d. How long is this project estimated to take?

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3 5 5 B D F 2A C 4c 6 Mo E G 20 6 H