The general fund budget (in billions of dollars) for a U.S. state for 1988 (period 1) to 2011 (period 24) follows. \begin{tabular}{|c|c|c|} \hline Year & Period & \begin{tabular}{c} Budget \\ (\$ billions) \end{tabular} \\ \hline 1988 & 1 & 3.03 \\ \hline 1989 & 2 & 3.29 \\ \hline 1990 & 3 & 3.56 \\ \hline 1991 & 4 & 4.41 \\ \hline 1992 & 5 & 4.36 \\ \hline 1993 & 6 & 4.61 \\ \hline 1994 & 7 & 4.75 \\ \hline 1995 & 8 & 5.15 \\ \hline 1996 & 9 & 5.34 \\ \hline 1997 & 10 & 5.66 \\ \hline 1998 & 11 & 6.11 \\ \hline 1999 & 12 & 6.30 \\ \hline 2000 & 13 & 6.48 \\ \hline 2001 & 14 & 6.65 \\ \hline 2002 & 15 & 6.66 \\ \hline 2003 & 16 & 6.88 \\ \hline 2004 & 17 & 6.98 \\ \hline 2005 & 18 & 7.65 \\ \hline 2006 & 19 & 8.48 \\ \hline 2007 & 20 & 8.57 \\ \hline 2008 & 21 & 8.76 \\ \hline 2009 & 22 & 8.43 \\ \hline 2010 & 23 & 8.23 \\ \hline 2011 & 24 & 8.76 \\ \hline \end{tabular} (b) Develop a linear trend equation for this time series to forecast the budget (in billions of dollars). (Round your numerical values to three decimal places.) Tt= (c) What is the forecast (in billions of dollars) for period 25? (Round your answer to two decimal places.) $ billion