Multiple Choice
The following table shows the numbers of U.S. cellular subscriberships (in millions) from 1985 to 2002. 
Source: The CTIA Semi-Annual Wireless Industry Survey
Assume that the number of U.S. cellular subscriberships, in millions, can be modeled by the function 
, where t is the number of years past 1980. Use the second derivative to estimate how fast the rate of increase in subscriberships was changing in 1991 in millions of subscriberships per year.
A) 121.08
B) -121.08
C) 1.08
D) -1.08
E) 0
Correct Answer:
Verified
Correct Answer:
Verified
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