There were 8.65 million licensed drivers in Pennsylvania in 2009 and 8.43 million in 2004. Find a formula for the number, N, of licensed drivers in the US as a function of t, the number of years since 2004, assuming growth is

Question

a) linear ->
b) exponential ->

Answer 1

What, you forget your algebra?
(a) N = 8.43 + (8.65-8.43)/(2009-2004)t
(b) N = 8.43 * (8.65/8.43)^(t/(2009-2004))

Answer 2

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