Dave Fecher was abie to determne the actvty tmes tor constructing ts laser scannina machine Fletcher woukd lke to determine ES$,$ EF LS$.$ LE and slack for each activity The total proect completion timend the ctcal path should also be detemined Here are the actvity timeseariest finish $($EF$)$ areActivity Time $($weeks$)$ Immediate PrecActivityActivity Time $($weeks$)$ Immediate Predecessorb$)$ESEFD