he number N (in millions) of US cellular phone subscribers is shown in the table. (Midyear estimates are given.)
t 1996 1998 2000 2002 2004 2006
N 44 67 103 141 184 233
(a) Use the data to sketch a rough graph of N as a function of t.
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(b) Use your graph to estimate the number of cell-phone subscribers at midyear in 2001 and 2005.
2001
million
2005
million
