# 7.5 Exponential Growth and Decay

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1 7.5 Exponential Growth and Decay Mark Woodard Furman U Fall 2010 Mark Woodard (Furman U) 7.5 Exponential Growth and Decay Fall / 11

2 Outline 1 The general model 2 Examples 3 Doubling-time and half-life 4 Compound interest Mark Woodard (Furman U) 7.5 Exponential Growth and Decay Fall / 11

3 The general model The law of natural growth Mark Woodard (Furman U) 7.5 Exponential Growth and Decay Fall / 11

4 The general model The law of natural growth Suppose that we know that a population is currently of size A. How big will the population be in t years? What is a good model for population growth? Mark Woodard (Furman U) 7.5 Exponential Growth and Decay Fall / 11

5 The general model The law of natural growth Suppose that we know that a population is currently of size A. How big will the population be in t years? What is a good model for population growth? If the conditions are right, we would expect that the rate of growth of the population would be proportional to the population. Mark Woodard (Furman U) 7.5 Exponential Growth and Decay Fall / 11

6 The general model The law of natural growth Suppose that we know that a population is currently of size A. How big will the population be in t years? What is a good model for population growth? If the conditions are right, we would expect that the rate of growth of the population would be proportional to the population. Let y(t) denote a population at time t. Then we can write this mathematically as { y = ky y(0) = A where k is the constant of proportionality. Mark Woodard (Furman U) 7.5 Exponential Growth and Decay Fall / 11

7 The general model The law of natural growth Suppose that we know that a population is currently of size A. How big will the population be in t years? What is a good model for population growth? If the conditions are right, we would expect that the rate of growth of the population would be proportional to the population. Let y(t) denote a population at time t. Then we can write this mathematically as { y = ky y(0) = A where k is the constant of proportionality. If k > 0, then this is a model for population growth; if k < 0, then this is a model for population decay. Mark Woodard (Furman U) 7.5 Exponential Growth and Decay Fall / 11

8 The general model Theorem The unique solution of the equation { y = ky is y(t) = Ae kt. y(0) = A Mark Woodard (Furman U) 7.5 Exponential Growth and Decay Fall / 11

9 The general model Theorem The unique solution of the equation { y = ky is y(t) = Ae kt. y(0) = A Proof. See board. Mark Woodard (Furman U) 7.5 Exponential Growth and Decay Fall / 11

10 Examples Problem Suppose that a certain culture of bacteria grew from 500 to 800 in 2 hours. Use an exponential growth model to predict the number of bacteria in 5 hours. Mark Woodard (Furman U) 7.5 Exponential Growth and Decay Fall / 11

11 Examples Problem Suppose that a certain culture of bacteria grew from 500 to 800 in 2 hours. Use an exponential growth model to predict the number of bacteria in 5 hours. Solution The growth constant is Thus y(t) = 500e (.235)t and k = (.5 ln 8/5).235 y(5) = 500e (.235)5 = Mark Woodard (Furman U) 7.5 Exponential Growth and Decay Fall / 11

12 Doubling-time and half-life Definition (Doubling-time and half-life) Mark Woodard (Furman U) 7.5 Exponential Growth and Decay Fall / 11

13 Doubling-time and half-life Definition (Doubling-time and half-life) When k > 0 (growth model), we will let T denote the time for a population to be doubled. T is called the doubling-time. Mark Woodard (Furman U) 7.5 Exponential Growth and Decay Fall / 11

14 Doubling-time and half-life Definition (Doubling-time and half-life) When k > 0 (growth model), we will let T denote the time for a population to be doubled. T is called the doubling-time. When k < 0 (decay model), we will let T denote the time for a population to be halved. T is called the half-life. Mark Woodard (Furman U) 7.5 Exponential Growth and Decay Fall / 11

15 Doubling-time and half-life Definition (Doubling-time and half-life) When k > 0 (growth model), we will let T denote the time for a population to be doubled. T is called the doubling-time. When k < 0 (decay model), we will let T denote the time for a population to be halved. T is called the half-life. Special formulas We can derive formulas for the doubling time and half life. Mark Woodard (Furman U) 7.5 Exponential Growth and Decay Fall / 11

16 Doubling-time and half-life Definition (Doubling-time and half-life) When k > 0 (growth model), we will let T denote the time for a population to be doubled. T is called the doubling-time. When k < 0 (decay model), we will let T denote the time for a population to be halved. T is called the half-life. Special formulas We can derive formulas for the doubling time and half life. If k > 0, then T = ln(2)/k. (doubling-time formula) Mark Woodard (Furman U) 7.5 Exponential Growth and Decay Fall / 11

17 Doubling-time and half-life Definition (Doubling-time and half-life) When k > 0 (growth model), we will let T denote the time for a population to be doubled. T is called the doubling-time. When k < 0 (decay model), we will let T denote the time for a population to be halved. T is called the half-life. Special formulas We can derive formulas for the doubling time and half life. If k > 0, then T = ln(2)/k. (doubling-time formula) if k < 0, then T = ln(.5)/k. (half-life formula) Mark Woodard (Furman U) 7.5 Exponential Growth and Decay Fall / 11

18 Doubling-time and half-life Problem The half-life of radium-226 is 1590 years. A certain sample has a weight of 2g. How much will this sample weigh in 5000 years? Mark Woodard (Furman U) 7.5 Exponential Growth and Decay Fall / 11

19 Doubling-time and half-life Problem The half-life of radium-226 is 1590 years. A certain sample has a weight of 2g. How much will this sample weigh in 5000 years? Solution We know that y(t) = Ae kt = 2e kt. where k is to be determined. We can find the constant k from our half-life formula. k = ln(.5) Thus y(t) = 2e t and y(5000) = 2e (5000).226g Mark Woodard (Furman U) 7.5 Exponential Growth and Decay Fall / 11

20 Compound interest Compound interest formula Suppose that you invest amount A 0 dollars into an account with annual rate r which compounds interest n times per year. Then after t years you will have ( A(t) = A r ) nt dollars n Mark Woodard (Furman U) 7.5 Exponential Growth and Decay Fall / 11

21 Compound interest Compound interest formula Suppose that you invest amount A 0 dollars into an account with annual rate r which compounds interest n times per year. Then after t years you will have ( A(t) = A r ) nt dollars n Problem \$500 is invested into an account which pays 8% compounded yearly. How much will you have in your account at the end of the twelfth year? Mark Woodard (Furman U) 7.5 Exponential Growth and Decay Fall / 11

22 Compound interest Compound interest formula Suppose that you invest amount A 0 dollars into an account with annual rate r which compounds interest n times per year. Then after t years you will have ( A(t) = A r ) nt dollars n Problem \$500 is invested into an account which pays 8% compounded yearly. How much will you have in your account at the end of the twelfth year? Solution The answer is 500(1 +.08) 12 = \$ Mark Woodard (Furman U) 7.5 Exponential Growth and Decay Fall / 11

23 Compound interest Problem Suppose that you invest \$150 into an account with rate r =.06 with monthly compoundings (n = 12). How much will you have in your account in 7 years? Mark Woodard (Furman U) 7.5 Exponential Growth and Decay Fall / 11

24 Compound interest Problem Suppose that you invest \$150 into an account with rate r =.06 with monthly compoundings (n = 12). How much will you have in your account in 7 years? Solution A(7) = 150(1.005) 84 = \$ Mark Woodard (Furman U) 7.5 Exponential Growth and Decay Fall / 11

25 Compound interest Problem If we let n, then the account is said to pay interest continuously. Show that A(t) = A 0 e rt in this case. Mark Woodard (Furman U) 7.5 Exponential Growth and Decay Fall / 11

26 Compound interest Problem If we let n, then the account is said to pay interest continuously. Show that A(t) = A 0 e rt in this case. Solution A(t) = lim n A 0 = lim n A 0 ( 1 + r ) nt n ( ( n/r ) n/r } {{ } converges to e ) rt = A 0 e rt Mark Woodard (Furman U) 7.5 Exponential Growth and Decay Fall / 11

27 Compound interest Problem Suppose that you invest \$150 into an account with rate r =.06 with continuous compoundings. How much will you have in your account in 7 years? Mark Woodard (Furman U) 7.5 Exponential Growth and Decay Fall / 11

28 Compound interest Problem Suppose that you invest \$150 into an account with rate r =.06 with continuous compoundings. How much will you have in your account in 7 years? Solution A(7) = 150e 7(.06) = \$ Mark Woodard (Furman U) 7.5 Exponential Growth and Decay Fall / 11

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