Schedule the following activities using CPM:

1. Which activities have slack, and how much?

\begin{tabular}{ccc} Activity & Immediate Predecessor & Time (weeks) \\ \hline A & - & 1 \\ B & A & 4 \\ C & A & 3 \\ D & B & 2 \\ E & C, D & 5 \\ F & D & 2 \\ G & F & 2 \\ H & E, G & 3 \\ \hline \end{tabular} \begin{tabular}{ccc} Activity & Immediate Predecessor & Time (weeks) \\ \hline A & - & 1 \\ B & A & 4 \\ C & A & 3 \\ D & B & 2 \\ E & C, D & 5 \\ F & D & 2 \\ G & F & 2 \\ H & E, G & 3 \\ \hline \end{tabular}