Please show me how to do I'm very confused

Chapter 6 Assignment i Saved Help Save & E Che 27 backward pass, compute activity slack, and identify the critical path. Use this information to create a Gantt chart for the project. Be sure to show slack for noncritical activities. Legend 0.8 ES ID EF points LS DUR LF B E G 4 Book 5 A D F H Hint 6 2 2 Print 2 References What are the critical activities? A, B, D, E, G, J What is the slack for B? What is the slack for C? What is the slack for E? What is the slack for F? What is the slack for G? What is the slack for H? What is the slack for I? What is the length of the project? time periods