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  1. AP Calculus
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Differential Equations

Question 1
college-boardCalculus AB/BCAPExam Style
1 mark

At what population value does the logistic model reach its carrying capacity?

Question 2
college-boardCalculus AB/BCAPExam Style
1 mark

If the series ∑n=1∞(−1)nn\sum_{n=1}^{\infty} \frac{(-1)^n}{\sqrt{n}}∑n=1∞​n​(−1)n​ converges, which test provides the justification?

Question 3
college-boardCalculus AB/BCAPExam Style
1 mark

Given that cell culture grows according logistical equation dpdt=rp(1−pC)\frac{dp}{dt}=rp\left(1-\frac{p}{C}\right)dtdp​=rp(1−Cp​), if researcher wishes double quantity cells within hours & knows exact doubling-time under current conditions, how she adjust paramet...

Question 4
college-boardCalculus AB/BCAPExam Style
1 mark

Which term in the logistic differential equation dPdt=kP(1−PL)\frac{dP}{dt} = kP \left(1 - \frac{P}{L} \right)dtdP​=kP(1−LP​) shows slowing down population growth?

Question 5
college-boardCalculus AB/BCAPExam Style
1 mark

For a modified logistic model given by dNdt=rN(1−(NnKn))\frac{dN}{dt}=rN\left(1-\left(\frac{N^n}{K^n}\right)\right)dtdN​=rN(1−(KnNn​)) where n>1n>1n>1, determine which initial condition will lead to an inflection point occurring at exactly half of carrying capacity.

Question 6
college-boardCalculus AB/BCAPExam Style
1 mark

For what values of xxx does the power series representation ∑n=0∞(x−3)n5n\sum_{n=0}^{\infty} \frac{(x-3)^n}{5^n}∑n=0∞​5n(x−3)n​ converge?

Question 7
college-boardCalculus AB/BCAPExam Style
1 mark

Which of the following statements is true regarding the logistic model's behavior when the initial population is below the carrying capacity?

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Question 8
college-boardCalculus AB/BCAPExam Style
1 mark

Which condition must be satisfied for a differential equation dPdt=kP(1−PL)\frac{dP}{dt}=kP(1-\frac{P}{L})dtdP​=kP(1−LP​) where P represents population at any time t and L is carrying capacity?

Question 9
college-boardCalculus AB/BCAPExam Style
1 mark

For what value of M does adding a term -MNP change a standard logistic growth model into a predator-prey model that exhibits cyclical behavior around non-trivial steady states if P represents predator population?

Question 10
college-boardCalculus AB/BCAPExam Style
1 mark

Given a logistic model dPdt=kP(1−PC)\frac{dP}{dt} = kP \left(1 - \frac{P}{C} \right)dtdP​=kP(1−CP​) where kkk is a positive constant and CCC is the carrying capacity, what value of PPP makes dPdt\frac{dP}{dt}dtdP​ equal to zero?