Please help with all problems in the picture. -Thank you

1. A public accounting firm requires the following activi- ties for an audit: Immediate Predecessor Activity Time Activity A A B D E F B, C A B, C , E, D 3 2 5 2 4 6 5 a. Draw a network for this project. b. Make a forward pass and a backward pass to deter- mine ES, LS, EF, and LF. c. What are the critical path and the project completion time? d. If the project completion must be reduced by two days, which activities might be affected