
Concept explainers
(a)
To find: The ratios of the population in one year by the population in previous year.
(a)

Answer to Problem 19E
The ratios of the population in one year by the population in previous year are 1.0322 , 1.0411 , 1.0339 , 1.0344 and 1.0292 .
Explanation of Solution
Given information:
Table below gives the population of Nevada for several years:
Population of Nevada | |
Year | Population(Thousands) |
2002 | 2168 |
2003 | 2238 |
2004 | 2330 |
2005 | 2409 |
2006 | 2492 |
2007 | 2565 |
Calculation:
The ratio of the population in 2003 by the population in 2002 is:
22382168=1.0322
The ratio of the population in 2004 by the population in 2003 is:
23302238=1.0411
The ratio of the population in 2005 by the population in 2004 is:
24092330=1.0339
The ratio of the population in 2006 by the population in 2005 is:
24922409=1.0344
The ratio of the population in 2007 by the population in 2006 is:
25652492=1.0292
Therefore, the ratios of the population in one year by the population in previous year are 1.0322 , 1.0411 , 1.0339 , 1.0344 and 1.0292 .
(b)
To find:The exponential model for the population of Nevada.
(b)

Answer to Problem 19E
The exponential model for the population of Nevada is 2168(1.03)n .
Explanation of Solution
Given information:
Table below gives the population of Nevada for several years:
Population of Nevada | |
Year | Population(Thousands) |
2002 | 2168 |
2003 | 2238 |
2004 | 2330 |
2005 | 2409 |
2006 | 2492 |
2007 | 2565 |
Calculation:
From part (a), the population of Nevada becomes 1.03 times every year.
Take n=0 for the year 2002 and the population in the initial year is 2168 thousands.
The exponential function for the population of Nevada is:
y=2168(1.034)n
Therefore, the exponential model for the population of Nevada is 2168(1.034)n .
(c)
To find:The population of Nevada in 2015 with the help of exponential model.
(c)

Answer to Problem 19E
The population of Nevada in 2015 will be 3348 thousands.
Explanation of Solution
Given information:
Table below gives the population of Nevada for several years:
Population of Nevada | |
Year | Population(Thousands) |
2002 | 2168 |
2003 | 2238 |
2004 | 2330 |
2005 | 2409 |
2006 | 2492 |
2007 | 2565 |
Calculation:
As calculated in part(b), the exponential model for the population of Nevada is:
y=2168(1.034)n
The initial value for n is zero in the year 2002 . So, the value n=13 corresponds to the year 2015 .
Substitute 13 for n in the exponential model.
y=2168(1.034)13
Use the calculator for the value of 2168(1.034)13 . Press “ON” button and enter the keystrokes as given below:
2168×(1.034)^13
The value of 2168(1.03)13 is 3348.31 thousands.
Therefore, the population of Nevada in 2015 will be 3348 thousands.
Chapter 1 Solutions
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