Need to answer the bottom half Dave's latest start (LS) and latest finish (LF) are:

for letter F, G & H

please show work as im trying to understand it or explain how you got the answer

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: Activity Time (weeks) Immediate Predecessor(s) Activity Time (weeks) Immediate Predecessor(s) 5 E 3 B B 6 F 6 B 2 G 9 C, E D 1 H 7 DF Dave's earliest start (ES) and earliest finish (EF) are: ES EF Activity A 0 5 B 0 6 7 5 5 D 6 E 6 9 F 6 12 G 9 18 H 12 19 Dave's latest start (LS) and latest finish (LF) are: LS LF Activity H 12 19 G 10 19 F 6 Enter your answer in the answer box and then click Check