To figure out how many vacation days she had left to use, Rosanne looked over her old calendars to figure out how many days of v
acation she had taken each year. Vacation days taken by Rosanne
Year Vacation days
2007 21
2008 37
2009 36
2010 39
2011 34
According to the table, what was the rate of change between 2008 and 2011?
