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A population grows according to an exponential growth model. The initial population is `P_0 = 16`, and the growth rate is `r = 0.4`.

Then:

`P_1` =
`P_2` =

Find an explicit formula for `P_n`. Your formula should involve `n`.

`P_n` =  

Use your formula to find `P_9`

`P_9` =

Give all answers accurate to at least one decimal place

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