In an effort to become greener, many cities have begun municipally run compost collection The table below lists the compostable materials collected in thousands of tonnes in one municipality from 2002 through 2008 Year 2002 2003 2004 2005 2006 2007 2008 Compost (1800 tonnes) 20.0 20.6 21.8 22.0 22.9 23.6 24.9 Determine the least squares trend-line equation