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    Hi, I am stuck on how to differentiate the following equation with respect to t.

    q(t)=20/(1+19e^-1.2t)

    Also does any know what an inflection point is?

    Thanks
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    You might as well call it differentiation in maths, as this is just maths.

    Here's your function written out in LaTex: q(t)=\displaystyle \frac{20}{1 + 19e^{-1.2t}} = 20(1+19e^{-1.2t})^{-1}

    Now, to differentiate this you'll ideally want to know the chain rule.
    Hint:
    Chain rule for differentiation of composite functions: If you have a function f(g(x)), then the differential is given by f'(g(x)).g'(x), i.e. \displaystyle \frac{dy}{dx} = \frac{dv}{du}. \frac{du}{dx}

    Hint 2:
    Let g(t) = u = 1 + 19e^{-1.2t} and let f(g(t)) = v = 20u^{-1}
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    (Original post by Eddy!)
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    I replied to you ^
 
 
 
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