I am not sure if this counts as homework but its a complex problem to me. I must find the inflection point of the equation (c/((1+ae^(-bx)))). Therefore I must take the 2nd derivative. Which I got as (abc)(e^(-bx))(abe^(-bx)-b)/((1+ae^(-bx))^7)). And this sounds wrong to me? Can someone tell me if I am on the right track?