How long can noncritical path activities be delayed without jeopardizing the overall completion date for this project?

Essentials of Applied Quantitative Methods for Health Services Managers[Pin It]12-1 Using the information in Table 12-7, construct a PERT network and answer each of the following questions:
a. What is the expected project completion data?
b. What is the scheduled start and completion date for each activity?
c. Which activities are on the critical path?
d. How long can noncritical path activities be delayed without jeopardizing the overall completion date for this project?
12-2 Assess the impact of the following changes to the time estimates provided in question 12-1. Individually, what is the impact if:ActivityPredecessorNew Time EstimateO. Advertise for new staffCollectively, what is the impact of these changes?12-3 As project manager for the example included in question 12-1, what would you recommend to preserve the original project completion date if activity A was reestimated to take 8 weeks, not the original 4 weeks? Provide details.