Find the domain of the rational function.
The domain of the given function is
The given function is
For the domain, the denominator should not be equal to zero.
Thus, the domain of the given function is all real numbers except .
Therefore the domain is
The concentration C of a certain drug in a patient's bloodstream t hours after injection is given by
Part (a): Find the horizontal asymptote of . What happens to the concentration of the drug as t increases?
Part (b): Using your graphing utility, graph .
Part (c): Determine the time at which the concentration is highest.
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