The percent p of impurities that can be removed from the waste water of a manufacturing process at a cost of C dollars is given by 
. Find any C values within the domain of the problem at which the rate of change of p with respect to C does not exist.
?
A. 
B. 
C. 
D. 
E. All C values within domain are valid.
Answer: E
Mathematics
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A. [-5, ?)
B. [7, ?)
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