The number N of locations of a popular coffeehouse chain is given in the table. (The numbers of locations as of June 30 are given.)

(a) Find the average rate of growth
(i) From 1996 to 1998
(ii) From 1997 to 1998
(iii) From 1998 to 1999
In each case, include the units.
(b) Estimate the instantaneous rate of growth in 1998 by taking the average of two average rates of change. What are its units?
(c) Estimate the instantaneous rate of growth in 1998 by measuring the slope of a tangent.

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1997 1998 2000 Year 1996 1999 2135 3300 1015 1886 1412