Joe is being audited by the IRS and must provide an estimate for his investment earnings over the next four years. After a thorough search, Joe can only find the following records.
Show how Joe can provide a reasonable estimate for 2007 - 2010.
Year Earnings
1997 $2,000
1998 $3,000
2000 $10,000
2003 $12,000
2004 $14,000
2006 $18,000