need some help with these

12-13 Draw the network and identify the critical path. Also calculate the earliest-latest starta ing and finishing times for each activity: Activity Preceding Activity Time (Weeks) D. E F G, H 12-14 Draw the network and identify the critical path. Also calculate the earliest-latest start- ing and finishing times for each activity Activity Preceding Activity Time (Weeks) A, B D, F F G, H