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- The Lotka-Volterra equations are often used to model the links between a particular population of prey organisms and a population of predatory organisms. In a particular ecosystem u is used to represent the number of predatory organisms and v to represent the number of prey organisms. Suppose the growth rate uv of the predatory organisms is f(u,v) = - 0.5u + and of the prey organisms is g(u,v) = 6v – 10uv. 100 (a) Show that if u = 0.6 and v = 50, then f (u,v) = 0, and g(u,v) = 0. (The populations are said to be in equilibrium.) %D %3D f(u,v) (b) Find the linear approximation of the vector valued function h:(u,v)→ if u is close to 0.6 and v is g(u,v) close to 50. (a) Evaluate f(u,v) at u = 0.6 and v = 50, f(0.6, 50) = (Type an integer.)(1 point) Find the function y of t which is the solution of 64y" - 25у %3D 0 yı (0) = 1, (0) = 0. with initial conditions %3D Yi = Find the function y, of t which is the solution of 64y" - 25у %3D 0 with initial conditions y2 (0) = 0, , (0) = 1. %3D Y2 = Find the Wronskian W(t) = W(y , y2). W (t) : Remark: You can find W by direct computation and use Abel's theorem as a check. You should find that W is not zero and so yı and y, form a fundamental set of solutions of 64y" – 25y = 0.An antibiotic is administered intravenouslyinto the bloodstream at a constant rate r. As the drug flowsthrough the patient’s system and acts on the infection that is present,it is removed from the bloodstream at a rate proportional tothe amount in the bloodstream at that time. Since the amount ofblood in the patient is constant, this means that the concentrationy = y(t) of the antibiotic in the bloodstream can be modeled bythe differential equation dy/dt = r - ky, k > 0 and constant. If y(0) = y0, find the concentration y(t) at any time t.
- Solve the initial-value problem for y as a function of x. (16 - x²) dy - y = x +4 X +9 = 1, y(0) = 9 XConsider a monopolist who produces aluminium and faces a demand given by: (please see attached photo). The monopolist's costs are C(q) = 2q(a) Obtain the equilibrium of this industry and the monopolist's market power. Consider now an aluminium recycling industry. The aluminium available in period "t" can be recycled in the following period "t+1". Let "x" belongs to [0,1] be the fraction of aluminium recycled. The recycling cost is C(x) = x/(1-x). Consider a 2-period model "t" belongs to {1,2} in which the recycling industry is competitive. Consider a discount factor (d = 0.8).(b) Obtain the equilibrium in the aluminium market in each period and the market power of the monopolist. (c) Does the existence of a recycling industry improve the welfare of society? If so, how much would the government be willing to contribute to develop this industry?(d) What would be expected to happen with qt when "t" is a continuous variable. In particular, what would happen in the long run? ("t" -->…A particular region has a rabbit population of 1600. Two foxes are introduced to control the population of rabbits. Following this, the number of rabbits decreases according to the formula R(t) = 1700 – Aekt. - where A and k are constants, and R(t) is the number of rabbits in the region t years after the introduction of the foxes. (a) Given that the population of rabbits drops by one quarter after 5 years, find the values of A and k. (b) Following this model, how long will it take for the rabbits to become extinct? Give your answer to two decimal places. (c) Let F(t) be the number of foxes in the region t years after their introduction. If dF = 0.7F(t), dt find the time at which the rate of decrease of the rabbit population is equal to the rate of increase of the fox population, correct to two decimal places. dR dF Hint. Note that and represent the rates of change of the rabbit and fox dt dt populations respectively. (d) Identify any problems with this model.
- Assume that N(t) denotes the density of an insect species at time t and P(t) denotes the density of its predator at time t. The insect species is an agricultural pest, and its predator is used as a biological control agent. Their dynamics are given below by the system of differential equations. Complete parts (a) through (c). dN = 7N - 5PN dt dP = 4PN - P dt ..... (a) Explain why dN = 7N describes the dynamics of the insect in the absence of the predator. dt If there are no predators present, then P(t) = for all t. Substitute P = in the given differential dN equations to get dt So in the absence of the predators, the above equation describes the dynamics of the insect population. dN Solve the equation, dt N(t) = (Type an expression using t as the variable.) Describe what happens to the insect population in the absence of the predator. In the absence of the predator, the insect populationsolve part (b) (iii)test the stability of dp/dt=cp(1-p)-ep. Given that p represents the fraction of islands occupied, 0 < p < 1. Let c represent the colonization rate and e represent the extinction rate. p1=0 and p2=1 - e/c, test the stability of p1 p2, graphically, through the first derivative test. Explicitly write d(dp/dt)/dp.
- A population grows from an initial size of 10 people to an amount P(t), given by P(t) = 10(3+0.5t + t), where t is measured in years from 1996. Find the acceleration in the population t years from 1996. O A. 60t people per year OB. 60 people per year Oc. 30t people per year? OD. (5+30t) people per yearA tank contains 1,000 L of pure water. Brine that contains 0.05 kg of salt per liter of water enters the tank at a rate of 5 L/min. Brine that contains 0.04 kg of salt per liter of water enters the tank at a rate of 10 L/min. The solution is kept thoroughly mixed and drains from the tank at a rate of 15 L/min. Let y(t) be the amount of salt (in kg) in the tank after t minutes. (a) Find the rate of change of amount of salt in the tank after t minutes. dy dt kg min How much salt is in the tank when t = 0? y(0) How much salt (in kg) is in the tank after t minutes? y = = kg (b) How much salt (in kg) is in the tank after 50 minutes? (Round the answer to one decimal place.) y(50) = kghelp