calculate population growth rate given intrinsic growth rate and population size
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If r = growth rate of a population, what has to change in the calculation of r in order to see a change in population size?
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Population Growth When predicting population growth, demographers must consider birth and death rates as well as the net change caused by the difference between the rates of immigration and emigration. Let $P$ be the population at time $t$ and let $N$ be the net increase per unit time resulting from the difference between immigration and emigration. So, the rate of growth of the population is given by $$\frac{d P}{d t}=k P+N$$ where $N$ is constant. Solve this differential equation to find $P$ as a function of time, when at time $t=0$ the size of the population is $P_{0} .$
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