Question
Geometrically interpret the growth rate corresponding to the population growth model
where r1 , k, k are constants, k being the carrying capacity of the population x(t) . Hence find when the growth is maximum.
a) Consider the cubic total cost function
C = 0.004q3-0.8q3 +10q+5.
Assume that the price of q is 13 per unit. Find the output which yields maximum profit.
Answer :
Word Count : 580
We are asked to solve two problems: one related to population growth and the other related to profit maximization. Let's solve both manually. --- ### 1. Population growth model The differential equation is: $$ \frac{dx}{dt} = r x \left(\frac{x}{k_0} - 1\right) \left(1 - \frac{x}{k}\right), \quad 0 < k_0 < k $$ with initial condition $x(0) = x_0$. Step 1: Geometrical interpretation * The growth rate $\frac{dx}{dt}$ is a cubic function of $x$. * It has three roots where $\frac{dx}{dt} = 0$: $$ x = 0, \quad x = k_0, \quad x = k $$ * The _________ ____ ________ _______ _________ _________ ___.
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We are asked to solve two problems: one related to population growth and the other related to profit maximization. Let's solve both manually. --- ### 1. Population growth model The differential equation is: $$ \frac{dx}{dt} = r x \left(\frac{x}{k_0} - 1\right) \left(1 - \frac{x}{k}\right), \quad 0 < k_0 < k $$ with initial condition $x(0) = x_0$. Step 1: Geometrical interpretation * The growth rate $\frac{dx}{dt}$ is a cubic function of $x$. * It has three roots where $\frac{dx}{dt} = 0$: $$ x = 0, \quad x = k_0, \quad x = k $$ * The _________ ____ ________ _______ _________ _________ ___.
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