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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §6.5 Separable Equations Including the Logistic Equation, #17 · Differential Equations · First-order

How many years to grow from … to

How many years to grow from $y_{0} = \frac{1}{2} c / b$ to $y = \frac{3}{4} c / b$ ? Use equation (10) for the time $t$ since the inflection point in 1988. When does $y$ reach 9 billion $= 9 c / b$ ?

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §6.5 Separable Equations Including the Logistic Equation, #17

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