The number N of US cellular phone subscribers (in millions) is shown in the table. (Midyear estimates are given.)

(a) Find the average rate of cell phone growth
(i) From 2002 to 2006
(ii) From 2002 to 2004
(iii) From 2000 to 2002
In each case, include the units.
(b) Estimate the instantaneous rate of growth in 2002 by taking the average of two average rates of change. What are its units?
(c) Estimate the instantaneous rate of growth in 2002 by measuring the slope of a tangent.

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199619982000200220042006 69 109 141 182 233