SOLUTION: A population grows according to an exponential growth model. The initial population is Po=14, and the growth rate is r=0.4. Find the explicit for Pn. The formula should involve n

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Question 1175117: A population grows according to an exponential growth model. The initial population is Po=14, and the growth rate is r=0.4.
Find the explicit for Pn. The formula should involve n.
Pn=

Answer by ikleyn(52802) About Me  (Show Source):
You can put this solution on YOUR website!
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The population increases from n to (n+1)  (from P%5Bn%5D  to  P%5Bn%2B1%5D)  with the multiplicative factor (1+0.4) = 1.4.


THEREFORE, the recursive formula is  P%5Bn%2B1%5D = 1.4%2AP%5Bn%5D.


It is the formula of a GEOMETRIC progression.


The explicit formula is  P%5Bn%5D = P%5B0%5D%2A1.4%5En = 14%2A1.4%5En,  n = 0, 1, 2, 3, . . .      ANSWER

Solved, explained and completed.

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On geometric progressions,  see introductory lessons
    - Geometric progressions
    - The proofs of the formulas for geometric progressions
    - Problems on geometric progressions
    - Word problems on geometric progressions
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    - ALGEBRA-II - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this online textbook under the topic
"Geometric progressions".

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