4. Collisions at between trains and automobiles have declined since the 1990's, presumably due to increased safety measures. Year 1990 1991 1992 1993 1994 1995 1996 Collisions 5388 4910 4892 4979 4633 4257 3865 3508 a) Make a graph of the data large enough to include the year 2020 (use graph paper, label completely, and choose the correct axis for the independent(x) and dependent(y) variables). b) Find the slope between 1991 and 1993. Explain the meaning of the slope in context. c) Find the slope between 2006 and 2010. Explain the meaning of the slope in context. d) Add a trend line to the graph. e) By reading the graph, estimate the number of collisions that might be expected in 2020. 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 3489 3502 3237 3077 2977 3077 3057 2936 2776 2429 1934 2052 2062 2011 1960