Project Management Questions!

Answer with explanations please. I really need to know how to do this. Thanks!

Given the below project network, answer the following questions. Resources indicate the number of workers necessary for each activity. ABC A. Compute the early, late and slack times. What is the project duration? B. Develop a load schedule assuming earliest start times. Identify resource peaks and valleys. What is the maximum load? C. Apply resource leveling. What is the maximum load? D. Assume the maximum number of workers at any given time is three. Apply resource-constrained scheduling and provide the new early, late and slack times. What is the project duration now? 2 2 2 Legend ES ID EF SL RESL 5 LS DU LF 2 1 1 1 3 1 2 3 7 2 2 6 4 1 1 5 2 ID RES DUR ES LF SL 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 Total Resource Load