It looks like my answer is wrong, so id like to know how to get that answer instead of just what the answer is.

id guess it would have something to do with the monthly payments part

\begin{tabular}{|l|l|} \hline Find future value & \\ \hline N=30 years, monthly payments & \\ \hline Interest rate =9%, compounded semi-annually & \\ \hline PV=0 & \\ \hline PMT=2500 & \\ \hline Compute FV & 723744 \\ \hline Round to 2 decimal places & \\ \hline \end{tabular}