a$.$ Determine the critical path.

A$-$E$-$G$-$C$-$D

$A-E-F-D$

A$-$B$-$C$-$D

b$.$ How many weeks will the project take to complete?

Answer is complete and correct.

$\backslash$table$[[\backslash$table$[[$Number of$],[$weeks$]],26]]$

c$.$ Suppose F could be shortened by two weeks and B by one week. By how many weeks would this reduce the project duration?

Answer is complete but not entirely correct.

$\backslash$table$[[$Number of weeks reduced,$178$