Questions: year 1998 1999 2000 2001 2002 2003 2004 2005 2006 sales 107 125 139 149 155 157 155 149 139 Determining the average rate of change of sales is important. It tells whether sales are increasing or decreasing over a time period, and at what rate. a) What was the average rate of change of annual sales between 1998 and 1999? millions of dollars/year b) What was the average rate of change of annual sales between 1998 and 2000? millions of dollars/year Give your answers as whole numbers.
Transcript text: \begin{tabular}{|c|r|r|r|r|r|r|r|r|r|}
\hline year & 1998 & 1999 & 2000 & 2001 & 2002 & 2003 & 2004 & 2005 & 2006 \\
\hline sales & 107 & 125 & 139 & 149 & 155 & 157 & 155 & 149 & 139 \\
\hline
\end{tabular}
Determining the average rate of change of sales is important. It tells whether sales are increasing or decreasing over a time period, and at what rate.
a) What was the average rate of change of annual sales between 1998 and 1999?
$\square$ millions of dollars/year
b) What was the average rate of change of annual sales between 1998 and 2000?
$\square$ millions of dollars/year
Give your answers as whole numbers.
Solution
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