Question 1138076
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The population of a fish farm in t years is modeled by the equation P(t)= 1000/1+9e^0.6t. 
To the nearest tenth, what is the doubling time for the fish population? 
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Your post has a  FATAL  ERROR.


The given formula   P(t) = {{{1000/(1+9*e^(0.6t))}}}  predicts  DECAY  and  DECREASE  of the fish population,  but not increase.


See the plot below.



{{{graph( 330, 330, -1, 10, -10, 110,
          1000/(1+9*e^(0.6x))
)}}}


Plot y = {{{1000/(1+9*e^(0.6t))}}}