Algebra and Trigonometry (MindTap Course List)
4th Edition
ISBN: 9781305071742
Author: James Stewart, Lothar Redlin, Saleem Watson
Publisher: Cengage Learning
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Textbook Question
Chapter 4.2, Problem 30E
Tree Diameter For a certain type of tree the diameter D (in feet) depends on the tree’s age t (in years) according to the logistic growth model
Find the diameter of a 20-year-old tree.
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Chapter 4 Solutions
Algebra and Trigonometry (MindTap Course List)
Ch. 4.1 - The function f(x)=5x is an exponential function...Ch. 4.1 - Prob. 2ECh. 4.1 - a To obtain the graph of g(x)=2x1, we start with...Ch. 4.1 - In the formula A(t)=P(1+rn)nt for compound...Ch. 4.1 - Prob. 5ECh. 4.1 - Prob. 6ECh. 4.1 - Prob. 7ECh. 4.1 - Prob. 8ECh. 4.1 - Prob. 9ECh. 4.1 - Prob. 10E
Ch. 4.1 - Prob. 11ECh. 4.1 - Prob. 12ECh. 4.1 - Prob. 13ECh. 4.1 - Prob. 14ECh. 4.1 - Prob. 15ECh. 4.1 - Prob. 16ECh. 4.1 - Prob. 17ECh. 4.1 - Prob. 18ECh. 4.1 - Prob. 19ECh. 4.1 - Prob. 20ECh. 4.1 - Prob. 21ECh. 4.1 - Prob. 22ECh. 4.1 - 2124 Exponential Functions from a Graph Find the...Ch. 4.1 - 2124 Exponential Functions from a Graph Find the...Ch. 4.1 - 2526 Exponential Functions from a Graph Match the...Ch. 4.1 - 2526 Exponential Functions from a Graph Match the...Ch. 4.1 - 2740 Graphing Exponential Functions Graph the...Ch. 4.1 - Prob. 28ECh. 4.1 - Prob. 29ECh. 4.1 - Prob. 30ECh. 4.1 - Prob. 31ECh. 4.1 - Prob. 32ECh. 4.1 - Prob. 33ECh. 4.1 - Prob. 34ECh. 4.1 - Prob. 35ECh. 4.1 - Prob. 36ECh. 4.1 - Prob. 37ECh. 4.1 - Prob. 38ECh. 4.1 - Prob. 39ECh. 4.1 - Prob. 40ECh. 4.1 - Prob. 41ECh. 4.1 - Prob. 42ECh. 4.1 - Prob. 43ECh. 4.1 - Prob. 44ECh. 4.1 - 4546 Comparing Exponential and Power Functions In...Ch. 4.1 - 4546 Comparing Exponential and Power Functions In...Ch. 4.1 - Prob. 47ECh. 4.1 - Prob. 48ECh. 4.1 - Prob. 49ECh. 4.1 - Prob. 50ECh. 4.1 - Prob. 51ECh. 4.1 - 5152 Difference Quotients These exercises involve...Ch. 4.1 - Prob. 53ECh. 4.1 - Prob. 54ECh. 4.1 - Prob. 55ECh. 4.1 - Prob. 56ECh. 4.1 - Prob. 57ECh. 4.1 - Prob. 58ECh. 4.1 - Prob. 59ECh. 4.1 - Compound Interest If 4000 is borrowed at a rate of...Ch. 4.1 - Prob. 61ECh. 4.1 - Prob. 62ECh. 4.1 - Prob. 63ECh. 4.1 - Prob. 64ECh. 4.1 - Prob. 65ECh. 4.1 - Prob. 66ECh. 4.2 - Prob. 1ECh. 4.2 - Prob. 2ECh. 4.2 - 34 Evaluating Exponential Functions Use a...Ch. 4.2 - Prob. 4ECh. 4.2 - Prob. 5ECh. 4.2 - Prob. 6ECh. 4.2 - Prob. 7ECh. 4.2 - Prob. 8ECh. 4.2 - Prob. 9ECh. 4.2 - Prob. 10ECh. 4.2 - Prob. 11ECh. 4.2 - Prob. 12ECh. 4.2 - Prob. 13ECh. 4.2 - Prob. 14ECh. 4.2 - Prob. 15ECh. 4.2 - Prob. 16ECh. 4.2 - Prob. 17ECh. 4.2 - Hyperbolic sine Function The hyperbolic sine...Ch. 4.2 - Prob. 19ECh. 4.2 - Prob. 20ECh. 4.2 - Prob. 21ECh. 4.2 - Prob. 22ECh. 4.2 - Medical Drugs When a certain medical drug is...Ch. 4.2 - Prob. 24ECh. 4.2 - Prob. 25ECh. 4.2 - Mixtures and concentrations A 50-gal barrel is...Ch. 4.2 - Logistic Growth Animal populations are not capable...Ch. 4.2 - Bird Population The population of a certain...Ch. 4.2 - Prob. 29ECh. 4.2 - Tree Diameter For a certain type of tree the...Ch. 4.2 - Prob. 31ECh. 4.2 - Prob. 32ECh. 4.2 - Prob. 33ECh. 4.2 - Prob. 34ECh. 4.2 - Prob. 35ECh. 4.2 - Prob. 36ECh. 4.2 - Prob. 37ECh. 4.2 - Prob. 38ECh. 4.2 - Prob. 39ECh. 4.3 - logx is the exponent to which the base 10 must be...Ch. 4.3 - Prob. 2ECh. 4.3 - Prob. 3ECh. 4.3 - Prob. 4ECh. 4.3 - Prob. 5ECh. 4.3 - Prob. 6ECh. 4.3 - Prob. 7ECh. 4.3 - 78 Logarithmic and Exponential forms Complete the...Ch. 4.3 - Prob. 9ECh. 4.3 - Prob. 10ECh. 4.3 - Prob. 11ECh. 4.3 - Prob. 12ECh. 4.3 - Prob. 13ECh. 4.3 - Prob. 14ECh. 4.3 - Prob. 15ECh. 4.3 - Prob. 16ECh. 4.3 - Prob. 17ECh. 4.3 - Prob. 18ECh. 4.3 - Prob. 19ECh. 4.3 - Prob. 20ECh. 4.3 - Prob. 21ECh. 4.3 - Prob. 22ECh. 4.3 - Prob. 23ECh. 4.3 - Prob. 24ECh. 4.3 - Prob. 25ECh. 4.3 - Prob. 26ECh. 4.3 - Prob. 27ECh. 4.3 - Prob. 28ECh. 4.3 - Prob. 29ECh. 4.3 - Prob. 30ECh. 4.3 - Prob. 31ECh. 4.3 - Prob. 32ECh. 4.3 - Prob. 33ECh. 4.3 - Prob. 34ECh. 4.3 - Prob. 35ECh. 4.3 - Prob. 36ECh. 4.3 - Prob. 37ECh. 4.3 - Prob. 38ECh. 4.3 - Prob. 39ECh. 4.3 - Prob. 40ECh. 4.3 - Prob. 41ECh. 4.3 - Prob. 42ECh. 4.3 - Prob. 43ECh. 4.3 - Prob. 44ECh. 4.3 - Prob. 45ECh. 4.3 - 4548 Evaluating Logarithms Use a calculator to...Ch. 4.3 - Prob. 47ECh. 4.3 - Prob. 48ECh. 4.3 - Prob. 49ECh. 4.3 - Prob. 50ECh. 4.3 - Prob. 51ECh. 4.3 - Prob. 52ECh. 4.3 - Prob. 53ECh. 4.3 - Prob. 54ECh. 4.3 - Prob. 55ECh. 4.3 - Prob. 56ECh. 4.3 - Prob. 57ECh. 4.3 - Prob. 58ECh. 4.3 - Prob. 59ECh. 4.3 - Prob. 60ECh. 4.3 - Prob. 61ECh. 4.3 - Prob. 62ECh. 4.3 - Prob. 63ECh. 4.3 - Prob. 64ECh. 4.3 - Prob. 65ECh. 4.3 - Prob. 66ECh. 4.3 - Prob. 67ECh. 4.3 - Prob. 68ECh. 4.3 - Prob. 69ECh. 4.3 - Prob. 70ECh. 4.3 - Prob. 71ECh. 4.3 - Prob. 72ECh. 4.3 - Prob. 73ECh. 4.3 - Prob. 74ECh. 4.3 - Prob. 75ECh. 4.3 - Prob. 76ECh. 4.3 - Prob. 77ECh. 4.3 - Prob. 78ECh. 4.3 - Prob. 79ECh. 4.3 - Prob. 80ECh. 4.3 - Prob. 81ECh. 4.3 - Prob. 82ECh. 4.3 - Prob. 83ECh. 4.3 - Prob. 84ECh. 4.3 - Prob. 85ECh. 4.3 - Prob. 86ECh. 4.3 - Prob. 87ECh. 4.3 - Prob. 88ECh. 4.3 - Prob. 89ECh. 4.3 - Prob. 90ECh. 4.3 - Prob. 91ECh. 4.3 - Prob. 92ECh. 4.3 - Prob. 93ECh. 4.3 - Prob. 94ECh. 4.3 - Prob. 95ECh. 4.3 - Prob. 96ECh. 4.3 - Prob. 97ECh. 4.3 - Prob. 98ECh. 4.3 - Prob. 99ECh. 4.3 - Prob. 100ECh. 4.3 - Difficulty of a Task The difficulty in "acquiring...Ch. 4.3 - Prob. 102ECh. 4.3 - DISCUSS: The Googolplex A googol is 10100, and a...Ch. 4.3 - Prob. 104ECh. 4.3 - DICUSS DISCOVER: The Number of Digits in an...Ch. 4.4 - The logarithm of a product of two numbers is the...Ch. 4.4 - Prob. 2ECh. 4.4 - Prob. 3ECh. 4.4 - Prob. 4ECh. 4.4 - Prob. 5ECh. 4.4 - a Most calculators can find logarithms with base...Ch. 4.4 - Prob. 7ECh. 4.4 - Prob. 8ECh. 4.4 - Prob. 9ECh. 4.4 - Prob. 10ECh. 4.4 - Prob. 11ECh. 4.4 - Prob. 12ECh. 4.4 - Prob. 13ECh. 4.4 - Prob. 14ECh. 4.4 - Prob. 15ECh. 4.4 - Prob. 16ECh. 4.4 - Prob. 17ECh. 4.4 - Prob. 18ECh. 4.4 - Prob. 19ECh. 4.4 - Prob. 20ECh. 4.4 - Prob. 21ECh. 4.4 - Prob. 22ECh. 4.4 - Prob. 23ECh. 4.4 - Prob. 24ECh. 4.4 - Prob. 25ECh. 4.4 - Prob. 26ECh. 4.4 - Prob. 27ECh. 4.4 - Prob. 28ECh. 4.4 - Prob. 29ECh. 4.4 - Prob. 30ECh. 4.4 - Prob. 31ECh. 4.4 - Prob. 32ECh. 4.4 - Prob. 33ECh. 4.4 - Prob. 34ECh. 4.4 - Prob. 35ECh. 4.4 - Prob. 36ECh. 4.4 - Prob. 37ECh. 4.4 - Prob. 38ECh. 4.4 - Prob. 39ECh. 4.4 - Prob. 40ECh. 4.4 - Prob. 41ECh. 4.4 - 2348 Expanding Logarithmic Expressions Use the...Ch. 4.4 - Prob. 43ECh. 4.4 - Prob. 44ECh. 4.4 - Prob. 45ECh. 4.4 - Prob. 46ECh. 4.4 - Prob. 47ECh. 4.4 - Prob. 48ECh. 4.4 - Prob. 49ECh. 4.4 - Prob. 50ECh. 4.4 - Prob. 51ECh. 4.4 - Prob. 52ECh. 4.4 - Prob. 53ECh. 4.4 - Prob. 54ECh. 4.4 - Prob. 55ECh. 4.4 - Prob. 56ECh. 4.4 - Prob. 57ECh. 4.4 - Prob. 58ECh. 4.4 - Prob. 59ECh. 4.4 - Prob. 60ECh. 4.4 - Prob. 61ECh. 4.4 - Prob. 62ECh. 4.4 - Prob. 63ECh. 4.4 - Prob. 64ECh. 4.4 - Prob. 65ECh. 4.4 - Prob. 66ECh. 4.4 - Prob. 67ECh. 4.4 - Prob. 68ECh. 4.4 - Prob. 69ECh. 4.4 - Prob. 70ECh. 4.4 - Prob. 71ECh. 4.4 - Prob. 72ECh. 4.4 - Wealth Distribution Vilfredo Pareto (18481923)...Ch. 4.4 - Prob. 74ECh. 4.4 - Magnitude of Stars The magnitude M of a star is a...Ch. 4.4 - Prob. 76ECh. 4.4 - Prob. 77ECh. 4.4 - Prob. 78ECh. 4.5 - Lets solve the exponential equation 2ex=50. a...Ch. 4.5 - Prob. 2ECh. 4.5 - Prob. 3ECh. 4.5 - Prob. 4ECh. 4.5 - Prob. 5ECh. 4.5 - Prob. 6ECh. 4.5 - Prob. 7ECh. 4.5 - Prob. 8ECh. 4.5 - Prob. 9ECh. 4.5 - Prob. 10ECh. 4.5 - Prob. 11ECh. 4.5 - Prob. 12ECh. 4.5 - Prob. 13ECh. 4.5 - Prob. 14ECh. 4.5 - Prob. 15ECh. 4.5 - Prob. 16ECh. 4.5 - Prob. 17ECh. 4.5 - Prob. 18ECh. 4.5 - Prob. 19ECh. 4.5 - Prob. 20ECh. 4.5 - 1138 Exponential Equations a Find the exact...Ch. 4.5 - Prob. 22ECh. 4.5 - Prob. 23ECh. 4.5 - Prob. 24ECh. 4.5 - Prob. 25ECh. 4.5 - Prob. 26ECh. 4.5 - Prob. 27ECh. 4.5 - Prob. 28ECh. 4.5 - Prob. 29ECh. 4.5 - Prob. 30ECh. 4.5 - Prob. 31ECh. 4.5 - Prob. 32ECh. 4.5 - Prob. 33ECh. 4.5 - Prob. 34ECh. 4.5 - Prob. 35ECh. 4.5 - Prob. 36ECh. 4.5 - Prob. 37ECh. 4.5 - Prob. 38ECh. 4.5 - Prob. 39ECh. 4.5 - Prob. 40ECh. 4.5 - Prob. 41ECh. 4.5 - Prob. 42ECh. 4.5 - Prob. 43ECh. 4.5 - Prob. 44ECh. 4.5 - Prob. 45ECh. 4.5 - Prob. 46ECh. 4.5 - Prob. 47ECh. 4.5 - Prob. 48ECh. 4.5 - Prob. 49ECh. 4.5 - Prob. 50ECh. 4.5 - Prob. 51ECh. 4.5 - Prob. 52ECh. 4.5 - Prob. 53ECh. 4.5 - Prob. 54ECh. 4.5 - Prob. 55ECh. 4.5 - Prob. 56ECh. 4.5 - Prob. 57ECh. 4.5 - Prob. 58ECh. 4.5 - Prob. 59ECh. 4.5 - Prob. 60ECh. 4.5 - Prob. 61ECh. 4.5 - Prob. 62ECh. 4.5 - Prob. 63ECh. 4.5 - Prob. 64ECh. 4.5 - Prob. 65ECh. 4.5 - Prob. 66ECh. 4.5 - Prob. 67ECh. 4.5 - Prob. 68ECh. 4.5 - Prob. 69ECh. 4.5 - Prob. 70ECh. 4.5 - Prob. 71ECh. 4.5 - Prob. 72ECh. 4.5 - Prob. 73ECh. 4.5 - Prob. 74ECh. 4.5 - Prob. 75ECh. 4.5 - Prob. 76ECh. 4.5 - Prob. 77ECh. 4.5 - Prob. 78ECh. 4.5 - Prob. 79ECh. 4.5 - Prob. 80ECh. 4.5 - Prob. 81ECh. 4.5 - Prob. 82ECh. 4.5 - Prob. 83ECh. 4.5 - Prob. 84ECh. 4.5 - Prob. 85ECh. 4.5 - Prob. 86ECh. 4.5 - Prob. 87ECh. 4.5 - Prob. 88ECh. 4.5 - Prob. 89ECh. 4.5 - Prob. 90ECh. 4.5 - Prob. 91ECh. 4.5 - Prob. 92ECh. 4.5 - Prob. 93ECh. 4.5 - Prob. 94ECh. 4.5 - Prob. 95ECh. 4.5 - Prob. 96ECh. 4.5 - Fish Population A small lake is stocked with a...Ch. 4.5 - Prob. 98ECh. 4.5 - Prob. 99ECh. 4.5 - Cooling an Engine Suppose youre driving your car...Ch. 4.5 - Electric circuits An electric circuit contains a...Ch. 4.5 - Learning Curve A learning curve is a graph of a...Ch. 4.5 - Prob. 103ECh. 4.5 - Prob. 104ECh. 4.5 - Prob. 105ECh. 4.6 - 116 Population Growth These exercises use the...Ch. 4.6 - 116 Population Growth These exercises use the...Ch. 4.6 - Prob. 3ECh. 4.6 - Prob. 4ECh. 4.6 - Prob. 5ECh. 4.6 - Prob. 6ECh. 4.6 - Prob. 7ECh. 4.6 - Prob. 8ECh. 4.6 - Prob. 9ECh. 4.6 - 116 Population Growth These exercises use the...Ch. 4.6 - 116 Population Growth These exercises use the...Ch. 4.6 - 116 Population Growth These exercises use the...Ch. 4.6 - 116 Population Growth These exercises use the...Ch. 4.6 - Prob. 14ECh. 4.6 - 116 Population Growth These exercises use the...Ch. 4.6 - Prob. 16ECh. 4.6 - Prob. 17ECh. 4.6 - Prob. 18ECh. 4.6 - Prob. 19ECh. 4.6 - Prob. 20ECh. 4.6 - Prob. 21ECh. 4.6 - Prob. 22ECh. 4.6 - Prob. 23ECh. 4.6 - Prob. 24ECh. 4.6 - 2528 Law of Cooling These exercises use Newtons...Ch. 4.6 - 2528 Law of Cooling These exercises use Newtons...Ch. 4.6 - Prob. 27ECh. 4.6 - Prob. 28ECh. 4.7 - Prob. 1ECh. 4.7 - Prob. 2ECh. 4.7 - Ion Concentration The pH reading of a sample of...Ch. 4.7 - Prob. 4ECh. 4.7 - Prob. 5ECh. 4.7 - Prob. 6ECh. 4.7 - pH of Wine If the pH of a wine is too high, say,...Ch. 4.7 - pH of Saliva The pH of saliva is normally in the...Ch. 4.7 - 9. Earthquake Magnitude and Intensity a Find the...Ch. 4.7 - Prob. 10ECh. 4.7 - Prob. 11ECh. 4.7 - Prob. 12ECh. 4.7 - Prob. 13ECh. 4.7 - Prob. 14ECh. 4.7 - Prob. 15ECh. 4.7 - Prob. 16ECh. 4.7 - Prob. 17ECh. 4.7 - Prob. 18ECh. 4.7 - Hearing Loss from MP3 Players Recent research has...Ch. 4.7 - Prob. 20ECh. 4.7 - Prob. 21ECh. 4.CR - Let f be the exponential function with base a. a...Ch. 4.CR - Prob. 2CCCh. 4.CR - Prob. 3CCCh. 4.CR - Prob. 4CCCh. 4.CR - Prob. 5CCCh. 4.CR - Prob. 6CCCh. 4.CR - Prob. 7CCCh. 4.CR - Prob. 8CCCh. 4.CR - Prob. 9CCCh. 4.CR - Prob. 10CCCh. 4.CR - Prob. 11CCCh. 4.CR - Prob. 12CCCh. 4.CR - Suppose that the initial mass of radioactive...Ch. 4.CR - Prob. 14CCCh. 4.CR - Prob. 15CCCh. 4.CR - Prob. 16CCCh. 4.CR - Prob. 17CCCh. 4.CR - Prob. 18CCCh. 4.CR - Prob. 1ECh. 4.CR - Prob. 2ECh. 4.CR - Prob. 3ECh. 4.CR - Prob. 4ECh. 4.CR - Prob. 5ECh. 4.CR - Prob. 6ECh. 4.CR - Prob. 7ECh. 4.CR - Prob. 8ECh. 4.CR - Prob. 9ECh. 4.CR - Prob. 10ECh. 4.CR - Prob. 11ECh. 4.CR - Prob. 12ECh. 4.CR - Prob. 13ECh. 4.CR - Prob. 14ECh. 4.CR - Prob. 15ECh. 4.CR - Prob. 16ECh. 4.CR - Prob. 17ECh. 4.CR - Prob. 18ECh. 4.CR - Prob. 19ECh. 4.CR - Prob. 20ECh. 4.CR - Prob. 21ECh. 4.CR - Prob. 22ECh. 4.CR - Prob. 23ECh. 4.CR - Prob. 24ECh. 4.CR - Prob. 25ECh. 4.CR - Prob. 26ECh. 4.CR - 2528 Logarithmic Form Write the equation in...Ch. 4.CR - Prob. 28ECh. 4.CR - Prob. 29ECh. 4.CR - Prob. 30ECh. 4.CR - Prob. 31ECh. 4.CR - Prob. 32ECh. 4.CR - Prob. 33ECh. 4.CR - Prob. 34ECh. 4.CR - Prob. 35ECh. 4.CR - Prob. 36ECh. 4.CR - Prob. 37ECh. 4.CR - Prob. 38ECh. 4.CR - Prob. 39ECh. 4.CR - Prob. 40ECh. 4.CR - Prob. 41ECh. 4.CR - Prob. 42ECh. 4.CR - Prob. 43ECh. 4.CR - Prob. 44ECh. 4.CR - Prob. 45ECh. 4.CR - Prob. 46ECh. 4.CR - Prob. 47ECh. 4.CR - Prob. 48ECh. 4.CR - Prob. 49ECh. 4.CR - Prob. 50ECh. 4.CR - Prob. 51ECh. 4.CR - Prob. 52ECh. 4.CR - Prob. 53ECh. 4.CR - Prob. 54ECh. 4.CR - Prob. 55ECh. 4.CR - Prob. 56ECh. 4.CR - Prob. 57ECh. 4.CR - Prob. 58ECh. 4.CR - Prob. 59ECh. 4.CR - Prob. 60ECh. 4.CR - Prob. 61ECh. 4.CR - Prob. 62ECh. 4.CR - Prob. 63ECh. 4.CR - Prob. 64ECh. 4.CR - Prob. 65ECh. 4.CR - Prob. 66ECh. 4.CR - Prob. 67ECh. 4.CR - Prob. 68ECh. 4.CR - Prob. 69ECh. 4.CR - Prob. 70ECh. 4.CR - Prob. 71ECh. 4.CR - Prob. 72ECh. 4.CR - Prob. 73ECh. 4.CR - Prob. 74ECh. 4.CR - Prob. 75ECh. 4.CR - Prob. 76ECh. 4.CR - Prob. 77ECh. 4.CR - 7578 Local Extrema and Asymptotes Draw a graph of...Ch. 4.CR - Prob. 79ECh. 4.CR - Prob. 80ECh. 4.CR - Prob. 81ECh. 4.CR - Prob. 82ECh. 4.CR - Prob. 83ECh. 4.CR - Prob. 84ECh. 4.CR - Prob. 85ECh. 4.CR - Prob. 86ECh. 4.CR - 8588 Change of Base Use the Change of Base...Ch. 4.CR - Prob. 88ECh. 4.CR - Prob. 89ECh. 4.CR - Prob. 90ECh. 4.CR - Prob. 91ECh. 4.CR - Prob. 92ECh. 4.CR - Prob. 93ECh. 4.CR - Prob. 94ECh. 4.CR - Prob. 95ECh. 4.CR - Prob. 96ECh. 4.CR - Prob. 97ECh. 4.CR - Bacterial Growth A culture contains 10,000...Ch. 4.CR - Prob. 99ECh. 4.CR - Radioactive Decay A sample of bismuth-210 decayed...Ch. 4.CR - Radioactive Decay The half-life of radium-226 is...Ch. 4.CR - Prob. 102ECh. 4.CR - Bird Population The graph shows the population of...Ch. 4.CR - Prob. 104ECh. 4.CR - Prob. 105ECh. 4.CR - Prob. 106ECh. 4.CR - Prob. 107ECh. 4.CR - Decibel Scale The drilling of a jackhammer was...Ch. 4.CT - Sketch the graph of each function, and state its...Ch. 4.CT - Find the domain of the function. a f(t)=ln(2t3) b...Ch. 4.CT - Prob. 3CTCh. 4.CT - Prob. 4CTCh. 4.CT - Prob. 5CTCh. 4.CT - Prob. 6CTCh. 4.CT - Prob. 7CTCh. 4.CT - Prob. 8CTCh. 4.CT - Prob. 9CTCh. 4.CT - Prob. 10CTCh. 4.CT - Prob. 11CTCh. 4.CT - The half-life of krypton-91(91Kr) is 10 s. At time...Ch. 4.CT - An earthquake measuring 6.4 on the Richter scale...Ch. 4.FOM - U.S. Population The U.S. Constitution requires a...Ch. 4.FOM - A Falling Ball In a physics experiment a lead ball...Ch. 4.FOM - Half-Life of Radioactive Iodine A student is...Ch. 4.FOM - The Beer-Lambert Law As sunlight passes through...Ch. 4.FOM - Prob. 5PCh. 4.FOM - Prob. 6PCh. 4.FOM - Prob. 7PCh. 4.FOM - Prob. 8PCh. 4.FOM - Prob. 9PCh. 4.FOM - Prob. 10P
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- Logistic Growth Animal populations are not capable of unrestricted growth because of limited habitat and food supplies. Under such conditions the population follows a logistic growth model: p(t)=d1+kea Where c, d, and k are positive constants. For a certain fish population in a small pond d=1200, k=11, c=0.2, and t is measured in years. The fish were introduced into the pond at time t=0 . How many fish were originally put in the pond? Find the population after 10, 20, and 30 years. Evaluate p(t) for large values of t. What value does the population approach as t? Does the graph shown confirm your calculations?arrow_forwardBird Population The population of a certain species of bird is limited by the type of habitat required for nesting. The population behaves according to the logistic growth model n(t)=56000.5+27.5e0.044t where t is measured in years. a Find the initial bird population. b Draw a graph of the function n(t). c What size does the population approach as time goes on?arrow_forwardBird Population The population of a certain species of bird is limited by the type of habitat required for nesting. The population behaves according to the logistic growth model p(t)=73.26.1+5.9e0.02r Where t is measured in years. Find the initial bird population. Draw a graph of the function n(t) . What size does the population approach as time goes on?arrow_forward
- Compound Interest Complete the table for the time t (in years) necessary for P dollars to triple when it is invested at an interest rate r compounded (a) continuously and (b) annually.arrow_forwardLogistic Growth Animal populations are not capable of unrestricted growth becomes of limited habitat and food supplies. Under such conditions the population follows a logistic growth model: P(t)=d1+kect where c, d, and k are positive constants. For a certain fish population is a small pond d=1200,k=11,c=0.2, and t is measured in years. The fish were introduced into the pond at time t=0. a How many fish were originally put in the pond? b Find the population after 10, 20, and 30 years. c Evaluate P(t) for large values of t. What value does the population approach as t? Does the graph show confirm your calculations?arrow_forwardA Population of Foxes A breeding group of foxes is introduced into a protected are and exhibits logistic population growth. After t years, the number of foxes is given by N(t)=37.50.25+0.76t foxes. a. How many foxes were introduced into the protected area? b. Calculate N(5) and explain the meaning of the number you have calculated. c. Explain how the population varies with time. Include in your explanation the average rate of increase over the first 10-year period and the average rate of increase over the second 10-year period. d. Find the carrying capacity for foxes in the protected area. e. As we saw in the discussion of terminal velocity for a skydiver, the question of when the carrying capacity is reached may lead to an involved discussion. We ask the question differently. When is 99 of carrying capacity reached?arrow_forward
- Population Growth A conservation organization released 100 animals of an endangered species into a game preserve. The preserve has a carrying capacity of 1000 animals. The growth of the pack is modeled by the logistic curve pt=10001+9e0.1656t where t is measured in months (see figure). (a) Estimate the population after 5 months. (b) After how many months is the population 500? (c) Use a graphing utility to graph the function. Use the graph to determine the horizontal asymptotes, and interpret the meaning of the asymptotes in the context of the problemarrow_forwardModeling Human Height with a Logistic Function A male child is 21inches long at birth and grows to an adult height of 73inches. In this exercise, we make a logistic model of his height as a function of age. a. Use the given information to find K and b for the logistic model. b. Suppose he reaches 95 of his adult height at age 16. Use this information and that from part a to find r. Suggestion: You will need to use either the crossing-graphs method or some algebra involving the logarithm. c. Make a logistic model for his height H, in inches, as a function of his age t, in years. d. According to the logistic model, at what age is he growing the fastest? e. Is your answer to part d consistent with your knowledge of how humans grow?arrow_forwardMore on the Pacific Sardine This is a continuation of Example 5.1. In this exercise, we explore the Pacific sardine population further, using the model in Example 5.1. a. If the current level of the Pacific sardine population is 50,000 tons, how long will it take for the population to recover to the optimum growth level of 1.2milliontons? Suggestion: One way to solve this is to make a new logistic formula using K2.4, r0.338, and N(0)0.05. b. The value of r used in Example 5.1 ignores the effects of fishing. If fishing mortality is taken into account, then r drops to 0.215 per year with the carrying capacity still at 2.4milliontons. Answer the question in part a using this lower value of r. Note: The population estimate of 50,000 tons and the adjusted value of r are given in the paper by Murphy see footnote 3 on page 347. Murphy points out that factoring in the growth of the competing anchovy population makes the recovery times even longer, and he adds. "It is disconcerting to realize how slowly the population will recover to its level of maximum productivity ... even if fishing stops." Studies to fit a logistic model to the Pacific sardine population have yielded. N=241+239e0.338t where t is measured in years and N is measured in millions of tons of fish. Part 1 What is r for the Pacific sardine? Part 2 According to the logistic model, in the absence of limiting factors, what would be the annual percentage growth rate for the Pacific sardine? Part 3 What is the environmental carrying capacity K? Part 4 What is the optimum yield level? Part 5 Make a graph of N versus t. Part 6 At what time t should the population he harvested? Part 7 What portion of the graph is concave up? What portion is concave down?arrow_forward
- Logistic Population growth the table and scatter plot give the population of black flies in a closed laboratory container over an 18 day period. (a) Use the logistic command on your calculator to find a logistic model for these data. (b) Use the model to estimate the time when there were 400 flies in the containerarrow_forwardA Population of Foxes A breeding group of foxes is introduced into a protected area, and the population growth follws a logistic pattern. After t years, the population of foxes is given by N=37.50.25+0.76t foxes. a. How many foxes were intorduced into the protected area? b. Make a graph of N versus t and explain in words how the populatoin of foxes increases with time. c. When will the fox population reach 100 individuals?arrow_forward
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