The number (in millions) of U.S. cellular telephone subscribers can be described by , where x is the number of years past 1990. For years beyond 2010, does this graph increase or decrease? (Look at this graph in a window that includes these years.)
A)increases
B)decreases

Question

The number (in millions) of U.S. cellular telephone subscribers can be described by  , where x is the number of years past 1990. For years beyond 2010, does this graph increase or decrease? (Look at this graph in a window that includes these years.) ​
A)increases 
B)decreases

Quizplus · Accepted Answer

From the equation given, we can see that the variable x represents the number of years past 1990. Therefore, the year 2010 corresponds to x = 20. When we look at the graph in a window that includes years beyond 2010 (i.e. x > 20), we can see that the graph continues to increase. Therefore, the correct choice is A) increases.

The Number (In Millions) of U