Question: Problem $9-23($Algorithmic$)$ Consider the following project network. Note that the normal or expected activity times are denoted $\backslash$Tau i$,$ i $=$ A$,$ B$,...,$ I. Let xi $=$ the earliest finish time for activity i$.$ Formulate a linear programming model that can be used to determine the length of the critical path. For subtractive or negative numbers use a minus sign even

Problem $9-23($Algorithmic$)$

Consider the following project network. Note that the normal or expected activity times are denoted $\backslash$Tau i$,$ i $=$ A$,$ B$,...,$ I. Let xi $=$ the earliest finish time for activity i$.$ Formulate a linear programming model that can be used to determine the length of the critical path.

For subtractive or negative numbers use a minus sign even if there is a $+$ sign before the blank. If the constant is $"1"$ it must be entered in the box.