Credit and Debit Card Growth At the end of the first quarter of 2009, there were million
Chapter 1, Problem 119(choose chapter or problem)
Credit and Debit Card Growth At the end of the first quarter of 2009, there were million credit and signature debit cards in force on the four major U.S. credit card networks and at the end of the first quarter of 2006, there were 954.7 million credit and signature debit cards in force. Let correspond to the end of the first quarter of 2006. (a) Find an equation of the line containing the points (0, 954.7) and (3, 1147.5). (b) Give an interpretation of the slope of this line as an average rate of change. (c) Use the equation of the line found in part (a) to estimate the number of credit and signature debit cards that will be in force on the four major U.S. credit card networks at the end of the first quarter of 2011. (d) Use the equation of the line found in part (a) to estimate the year when the number of credit and signature debit cards that will be in force on the four major U.S. credit card networks will first exceed 1.5 billion cards. Source: CardData
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