a.
To graph: The number N
t | 1996 | 1998 | 2000 | 2002 | 2004 | 2006 |
N | 44 | 69 | 109 | 141 | 182 | 233 |
a.

Explanation of Solution
Given information:
The number N
t | 1996 | 1998 | 2000 | 2002 | 2004 | 2006 |
N | 44 | 69 | 109 | 141 | 182 | 233 |
Graph:
The graph of N vs t can be drawn by using t as x-axis and N as y-axis. The obtained graphs is as like this,
Interpretation:
The obtained graph shows that the number of US cellular phone subscribers are continuously increasing from 1996 to 2006.
b.
To calculate: The estimation of the number of cell-phone subscribers at midyear in 2001 and 2005, Using the given graph.
b.

Answer to Problem 21E
The estimated numbers of cell-phone subscribers at the midyear 2001 are 125 millions and at the midyear 2005 are 207.5 millions.
Explanation of Solution
Given information:
The number N
t | 1996 | 1998 | 2000 | 2002 | 2004 | 2006 |
N | 44 | 69 | 109 | 141 | 182 | 233 |
Calculation:
Consider the given graph, the year 2001 lies in between 2000 and 2002 on the x-axis. Now, take the corresponding value of y with respect to x as 2001, it is find out to be 125 on this graph.
Similarly, the year 2005 lies in between 2004 and 2006 on the x-axis. Now, take the corresponding value of y with respect to x as 2005, it is find out to be 207.5 on this graph.
Therefore, the estimated numbers of cell-phone subscribers at the midyear 2001 are 125 millions and at the midyear 2005 are 207.5 millions.
Chapter 1 Solutions
Bundle: Single Variable Calculus: Concepts And Contexts, Enhanced Edition, 4th + Webassign Printed Access Card For Stewart's Calculus: Concepts And Contexts, Multi-term
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