Dave Fletcher was able to determine the activity times for constructing his laser scanning machine. Fletcher would like to determine$$ ES$,$ EF$,$ LS$,$ LF$,$ and slack for each activity. The total project completion time and the critical path should also be determined. Here are the activity$$ times: What are daves earliest start $($ES$)$ and earliest finish $($EF$)$ for A through H$?$

What are Daves slack times for A through H$?$