need help with latest start $($LS$)$ and latest finish $($LF$)?$and the critical path should also be determined. Here are the activity times:

$\backslash$table$[[$Activity$,$Time $($weeks$)$ Immediate Predecessor$($s$),$Activity,Time $($weeks$),$Immediate Predecessor$($s$),],[$A$,7,-,$E$,3,$B$],[$B$,7,-,$F$,5,$B$],[$C$,2,$A$,$G$,10,$C$,$ E$],[$D$,1,$A$,$H$,6,$D$,$ F$]]$

Dave's earliest start $($ES$)$ and earliest finish $($EF$)$ are:

$\backslash$table$[[$Activity$,$ES$,$EF$],[$A$,0,7],[$B$,0,7],[$C$,7,9],[$D$,7,8],[$E$,7,10],[$F$,7,12],[$G$,10,20],[$H$,12,18]]$

Dave's latest start $($LS$)$ and latest finish $($LF$)$ are:

$\backslash$table$[[$Activity$,$LS$,$LF$],[H,14,$