Recent content by obperryo

ah, yes, 35 days, not years... mis-type copying from my paper. Just goes to show, like you said, write it out... If I did at the top, I probably wouldn't of made the mistake.

Yes, I think the rate is meant to be the rate at t=0 and the only reason the initial population of 100,000 is given is so you can figure out that 80% is 80,000, thus you are looking for the time at a population fo 80,000. I remember in one of my calculus classes this same thing happened...

It think I figured out the approach..: (in thousands) P = 100 Po = 50 Rate = 1 = dP/dt t = 0 What is t when P(t) = 80% of P? dP/dt = kP(M-P) 1 = k*50(100-50), so k = .0004 Then, once you know k, P(t) = M*P / Po + (M-Po)exp(-k*M*t) So then with P(t) = 80, t = 34.6574...

Well, I am learning, and having a very hard time coming up with an equation for this story problem,so I am not sure on what I should do. This issue has come up before, where the questions don't make complete sense. Here is the problem I am working exactly as it is written: Suppose at t=0...

Please help me set up this logistics equation. At t=0, half an alligator population (50,000) has contracted a disease that causes them to loose their teeth. Initial populations is 100,000. Disease spreads at rate of 1000 per day. I know that dP/dt = kP(M-P), but I am confused in how what...

Did you ever get this figured out? I am working on the same problem with the exact same issue .. the -1.