$3\mathrm{.}15$ Dave Fletcher $($see Problem $3\mathrm{.}12)$ was able to deter$-...$ mine 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:

$\backslash$table$[[$ACTIVITY$,$TIME $($WEEKS$),$ACTIVITY,TIME $($WEEKS$)],[$A$,6,$E$,4],[$B$,7,$F$,6],[$C$,3,$G$,10],[$D$,2,H,7]]$