You should have 15 different paths. That is, 15 rows of 0's and 1's pasted from Pathfind into your spreadsheet.
2b. The normal completion time:
The critical path:
Check off the activities that are in your critical path. (Not including dummy activities.)
3b. The completion time that gives you the least cost (including rewards for being early or penalties for being late):
3c. The total cost of the project at the most advantageous speed.
3d. The activities that are shortened from their normal times to meet
your optimal schedule:
3e. The critical activities -- the activities in the critical path(s):