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  1. AP Calculus
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Differential Equations

Question 1
college-boardCalculus AB/BCAPExam Style
1 mark

If a population grows continuously at a rate of 8% per year, which of the following represents the population as a function of time t, given an initial population of 5000?

Question 2
college-boardCalculus AB/BCAPExam Style
1 mark

For an unchanging population represented by an exponential model ΔpΔt=rp(1−pK)\frac{\Delta p}{\Delta t} = rp(1-\frac{p}{K})ΔtΔp​=rp(1−Kp​), which variable symbolizes carrying capacity?

Question 3
college-boardCalculus AB/BCAPExam Style
1 mark

If you are given a differential equation in the form dAdt=rA\frac{dA}{dt}=rAdtdA​=rA where rrr is constant, which statement is true about the solution for A(t)A(t)A(t)?

Question 4
college-boardCalculus AB/BCAPExam Style
1 mark

Given the differential equation dpdt=plog⁡(100−p)\frac{dp}{dt} = p \log(100 - p)dtdp​=plog(100−p), where ppp stands for population, how does ppp evolve as it gets close to 100?

Question 5
college-boardCalculus AB/BCAPExam Style
1 mark

Given an exponential model represented by the differential equation dNdt=rN(1−NK)2\frac{dN}{dt} = rN\left(1-\frac{N}{K}\right)^2dtdN​=rN(1−KN​)2, where both r (growth rate) and K (carrying capacity) are positive constants, how does N(t) behave for large t if initially N(0)<K?

Question 6
college-boardCalculus AB/BCAPExam Style
1 mark

For a bacterial population modeled by the differential equation dPdt=kP\frac{dP}{dt} = kPdtdP​=kP, where kkk is a constant, if the initial population is 500 and doubles in 3 hours, what is the value of kkk?

Question 7
college-boardCalculus AB/BCAPExam Style
1 mark

How would one determine when half the maximum carrying capacity is reached in a logistic growth model given by dydt=ry(1−yK)\frac{dy}{dt} = ry(1-\frac{y}{K})dtdy​=ry(1−Ky​), where r>0r>0r>0 and K>0K>0K>0 are constants?

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Question 8
college-boardCalculus AB/BCAPExam Style
1 mark

If Δy/Δx=ky\Delta y / \Delta x = kyΔy/Δx=ky, where kkk is a positive constant, what type of growth does yyy exhibit?

Question 9
college-boardCalculus AB/BCAPExam Style
1 mark

For a certain radioactive substance that decays exponentially, if its half-life is known to be T years, what differential equation models its decay over time?

Question 10
college-boardCalculus AB/BCAPExam Style
1 mark

For a continuously compounded interest account with principal amount A0A_0A0​ and rate of increase governed by dAdt=rA\frac{dA}{dt} = rAdtdA​=rA, what is lim⁡t→∞A(t)\lim_{t \to \infty} A(t)limt→∞​A(t) if r>0r > 0r>0?