Communication in 1996, there were 171 area codes in the united states. in 2007, there were 215. find the rate of change from 1996 to 2007.

4 area codes per year.

Step-by-step explanation:

There were 171 area cods in the United states in year 1996.

In 2007 there were 215 area codes. We have to find the rate of change from 1996 to 2007.

Since rate of change is defined by R =

=

=

= 4 area codes per year

Therefore, rate of change is 4 area codes per year.

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step-by-step explanation:

i would need to see the dot plot : )