place) (10%)7 Forecast equation F for the long-term tend of quarterly sales of a busiding 40.6.5t+2t2, salies volume and considering seasonal relntivily are as follows \begin{tabular}{|c|c|c|c|c|} \hline & 1 & 2 & 3 & 4 \\ \hline Litiess relativity & 1.1 & 1.0 & 0.6 & 1.3 \\ \hline \end{tabular}