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  1. D

    The number N (in millions) of US Cellular phone subscribers is shown in the table?

    t 1996 1998 2000 2002 2004 2006 n 44 69 109 141 182 233 (a) use the data to sketch a rough graph of N as a function of t (b) Use your graph to estimate the number of cell-phone subscribers at midyear in 2001 and 2005.
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