I'm having a little trouble figuring out how to calculate the derivative of a logistic function.
I'm starting to feel like this 'introduction to calculus' is a little bit above me, but oh well.
I originally just used the quotient rule,
Using those figures there, I ended up with
when solving for t=4.
Where am I going wrong?
Plugging in t=4 gets me 280, which is what i was after.