Biologists stocked a lake with 500 fish and estimated the carrying capacity (the maximalpopulation for the fish of that species in that lake) to be 8100. The number of fish doubled inthe first year.(a) Assuming that the size of the fish population satisfies the logistic equationdP - kp(1-2).=dtdetermine the constant k, and then solve the equation to find an expression for the size of thepopulation after t years.k -P(t) =(b) How long will it take for the population to increase to 4050 (half of the carrying capacity)?It will take 3.575 years.

Biologists stocked a lake with 500 fish and estimated the carrying capacity (the maximal population…

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Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

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Assume 100 snails originally have the virus and that in early stages the number of snails infected is increasing approximately exponentially, with a continuous growth rate of 0.02. Assume further that in the long run, they estimate approximately 5300 snails will be infected. The number of snails infected after t hours after infection began is modeled by a logistic function: P=L1+Ce−kt What is the value of t when the rate at which snails are becoming infected peaks? Select the closest value.
A colony of 120 wood frogs was introduced to a pond with a carrying capacity of C=300. The population grows according to the logistic growth model, with a growth parameter is r = 1.5. The logistic growth formula is: pN+1 = rpN(1-pN) a) Find the initial p-value: p0 = Answer b) Find the first p-value: p1 = Answer c) Find the second p-value: p2 = Answer
A study of Maryland's portion of Chesapeake Bay found the following information about stocks of market-sized oysters.† In 1994, the stocks were 218 million. (This is the number you will use for the initial population N(0).) The carrying capacity is 5089 million oysters. The intrinsic exponential growth rate is 0.274 per year. (a) Find a logistic model N(t) for the number, in millions, of market-sized oysters. Take t to be the time in years since 1994. (Rround all regression parameters to three decimal places.) N(t) = (b) Plot the graph of the model you found in part (a) over the first 20 years. (c) How many market-sized oysters does your model predict for 2007? Round your answer, in millions, to the nearest whole number. million oysters (d) The actual number of market-sized oysters was found to be 82 million. Use the Internet to find possible explanations for the reduced levels of oysters in Chesapeake Bay.
Biologists stocked a lake with 300 fish and estimated the carrying capacity (the maximal population for the fish of that species in that lake) to be 5000. The number of fish tripled in the first year. (a) Assuming that the size of the fish population satisfies the logistic equation dP = kp (1-P). (1-²), kP dt determine the constant k, and then solve the equation to find an expression for the size of the population after t years. k= P(t)= (b) How long will it take for the population to increase to 2500 (half of the carrying capacity)? It will take years.
In terms of the model parameters, state the null hypothesis that, after controlling for sales and roe, ros has no effect on CEO salary. State the alternative that better stock market performance increases a CEO’s salary.
A nation's population (to the nearest million) was 281 million in 2000 and 311 in 2010. It is projected that the population in 2050 will be 439 million. To construct a logistic model, both the growth rate and the carrying capacity must be estimated. There are several ways to estimate these parameters. Use parts (a) through (f) to use one approach. a. Assume that t = 0 corresponds to 2000 and that the population growth is exponential for the first ten years; that is, between 2000 and 2010, the population is given by P(t) = P(0) e". Estimate the growth rate r using this assumption. = (Round to five decimal places as needed.) b. Write the solution of the logistic equation with the value of r found in part (a). Write any populations in the logistic equation in millions of people. P(t) = Use the projected value P(50) = 439 million to find a value of the carrying capacity K. K= (Type an integer or decimal rounded to the nearest hundredth as needed.) c. According to the logistic model…

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