Chapter 1.2, Problem 80E

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, y	$1.30$	$1.15$	$1.00$	$0.84$	$0.69$	$0.56$

a. Plot the number of pay phones $\left(y\right)$ versus the year $\left(x\right)$.

b. Draw the straight line $L$ through the points $\left(0,1.30\right)$ and $\left(5,0.56\right)$.

c. Derive an equation for the line $L$.

d. Assuming that the trend continues, estimate the number of pay phones in $2012$.

Source: FCC