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The concentration `C` of a drug in a patient's bloodstream `t` hours after injection is given by `C=45*(t/(75+t^2))`.

a. What is the concentration of the drug after 2 hours? (round answer to two decimal places)



b. How long does this drug stay in someone's bloodstream? Assume that the drug is out of the patients system once the concentration has decreased to 0.5 %? (round to two decimal places) If your solution is a complex or imaginary number, enter "NAN" for "Not a Real Number".

hours

c. What is the end behavior of the function?