The following table shows the number of motor vehicle crash deaths for teens aged 13-19, separated by gender, for the years 2005-2015 (Data source: iihs.org). Create a table for each of these functions: ( + )() and ( )(). Describe what each of these two functions tells you in practical terms. Is the function ( + )() increasing or decreasing? What does this tell you?

Year (t)	Male (M	Female (F)
2005	3,496	1,803
2006	3,415	1,744
2007	3,280	1,701
2008	2,694	1,373
2009	2,222	1,257
2010	2,034	1,087
2011	1,991	1,041
2012	1,863	972
2013	1,661	880
2014	1,802	828
2015	1,788	926