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
Q217: Suppose that the revenue (in dollars) from
Q218: Find Q219: Find the indicated derivative. Find Q220: Find the indicated derivative. Find Q221: Total revenue is in dollars and x Q223: The following table shows the numbers of Q224: The graph of a company's total cost Q225: In this problem, cost is in dollars Q226: The graph of a company's total cost Q227: Total revenue is in dollars and x
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