   Chapter 1.4, Problem 78E

Chapter
Section
Textbook Problem

DECLINING NUMBER of pay PHONES As cell phones proliferate, the number of pay phones continues to drop. The number of pay phones from 2004 through 2009 (in millions) are shown in the following table (x = 0 corresponds to 2004): Year, x 0 1 2 3 4 5 Number of Pay Phones 1.30 1.5 1.00 0.84 0.69 0.56 a. Plot the number of pay phones (y) versus the year (x). b. Draw the straight line L through the points (0, 1.30) and (5, 0.56). c. Derive an equation for the line L. d. Assuming that the trend continues, estimate the number of pay phones in 2012.

(a)

To determine

To sketch: The graph of number of pay phones (y) versus the year (x) .

Explanation

The table shown below shows the number of pay phones from 2004 through 2009 ( in millions):

 Year, (x) 0 1 2 3 4 5 Number of pay phones, (y) 1.3 1.15 1 0

(b)

To determine

To sketch: The graph of a straight line through the points (0,1.30) and (5,0.56) .

(c)

To determine

To find: The equation of straight line through the points (0,1.30) and (5,0.56) .

(d)

To determine

To find: The value of number of pay phones in 2012.

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