Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN: 9780470458365
Author: Erwin Kreyszig
Publisher: Wiley, John & Sons, Incorporated
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Question
Don’t use calculus
Be sure to show all work and all problem solving strategies. Give complete explanations
for each step.
To study how species survive, scientists model their populations by observing the dif-
ferent stages in their life. Scientists consider, for example, the stage at which the animal
is fertile, the proportion of the population that reproduces, and the proportion of the
young that survive each year. In one study, scientists looked at an animal that is consid-
ered immature for the first year of its life, a juvenile for the second year of life, and an
adult for the remainder of its life. The following data was collected for this species:
Immature
0
Juvenile
0
0
Adult
0.4
0
A =
0.1
Immature
Juvenile
Adult
Xo =
600 Immature
400 Juvenile
3500 Adult
0
0.3
0.8
The entries in matrix A represent the percentage of the population that survives to the
next year. For example, in the first column, 0% of the immature animals remain imma-
ture, 10% become juveniles and, of course, none become adults (that takes two years)
Of the juveniles, none go backwards to become immature and 30% become adults. For
the adults, 40% reproduce and add to the immature population, none become juveniles,
and 80% go on to the next year (still as adults). The matrix Xo represents the number
of immature, juvenile, and adult animals in year 0.
Let X₁ = AXo, X2= AX1, X3 = AX2, etc.
1. Explain why X₁ gives the population in year 1, X₂ gives the population in year 2,
and so on.
2. Find the population matrices for years 1, 2, 3, and 4. Round to the nearest whole
numbers. Do you see any trends?
3. Show that X₂ = A²X0, X3 = A³ Xo, etc.
4. Find the population after 50 years that is, find X50. (Use your result from #3
and a graphing calculator, don't try to do this by hand.) Does it appear that the
population survives?
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Transcribed Image Text:Be sure to show all work and all problem solving strategies. Give complete explanations for each step. To study how species survive, scientists model their populations by observing the dif- ferent stages in their life. Scientists consider, for example, the stage at which the animal is fertile, the proportion of the population that reproduces, and the proportion of the young that survive each year. In one study, scientists looked at an animal that is consid- ered immature for the first year of its life, a juvenile for the second year of life, and an adult for the remainder of its life. The following data was collected for this species: Immature 0 Juvenile 0 0 Adult 0.4 0 A = 0.1 Immature Juvenile Adult Xo = 600 Immature 400 Juvenile 3500 Adult 0 0.3 0.8 The entries in matrix A represent the percentage of the population that survives to the next year. For example, in the first column, 0% of the immature animals remain imma- ture, 10% become juveniles and, of course, none become adults (that takes two years) Of the juveniles, none go backwards to become immature and 30% become adults. For the adults, 40% reproduce and add to the immature population, none become juveniles, and 80% go on to the next year (still as adults). The matrix Xo represents the number of immature, juvenile, and adult animals in year 0. Let X₁ = AXo, X2= AX1, X3 = AX2, etc. 1. Explain why X₁ gives the population in year 1, X₂ gives the population in year 2, and so on. 2. Find the population matrices for years 1, 2, 3, and 4. Round to the nearest whole numbers. Do you see any trends? 3. Show that X₂ = A²X0, X3 = A³ Xo, etc. 4. Find the population after 50 years that is, find X50. (Use your result from #3 and a graphing calculator, don't try to do this by hand.) Does it appear that the population survives?
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