Given 
, find the average rate of change of f (x) over the following pair of intervals using a calculator if desired:
?
and 
?
A. 17.9 and 17.99
B. 20.9 and 20.99
C. 19.90 and 19.99
D. 19.90 and 20.99
E. 17.9 and 19.99
Answer: C
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