annual coal production in the us in billion tons per year is given in the table. estimate hte total amount of coal produced in the US between 1997 and 2009. If r = f (t) is the rate of coal production t years since 1997, write an integral to represent the 1997 - 2009 coal production.Year : 1997 1999 2001 2003 2005 2007 2009Rate : 1.090 1.094 1.121 1.072 1.132 1.147 1.073



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