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help needed for growth and decay (1 Viewer)

johnle95

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hey guys
how would u do the questions attached?

thanks

Screen Shot 2013-03-20 at 2.34.50 AM.png

Screen Shot 2013-03-20 at 2.58.23 AM.png
 
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pdang

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You need to separate the variables and integrate



For the next part of the question follow these steps:
1. sub in t=0 and N=1500 for initial condition
2. solve for A
3. sub in t=5 and N=2200
4. solve for k
5. sub in N=2500
6. solve for t

The second question is essentially the same just with the two questions in one
 

Reloman

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An easier way to do 4a) is to:
N=P+Ae^kt, Ae^kt = N - P
dN/dt= kAe^kt, since Ae^kt = N - P
dN/dt = k(N-P)
 

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