If t is the expected completion time for a given activity th

If t is the expected completion time for a given activity, then:

LF = LS - t

EF = ES - t

EF = ES + t

EF = LS - t

Solution

Solution : C. EF = ES + t

Explanation :

Any activities without any immediate predecessors have an arrow pointing to them from the start node. These activities will all have an early start date, or ES, of 0. The early start date is the first day an activity can start if there are no delays. Once you have calculated the ES for any given activity you can immediately calculate the early finish date, or EF, as:

EF = ES + t

where t is the given activities duration (which is sometimes denoted by d).