The concentration `C` of a drug in a patient's bloodstream `t` hours after injection is given by `C=(40*t)/(63+t^2)`.

a. What is the concentration of the drug after 1 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 0.7 %? (round to two decimal places)

hours

c. What is the end behavior of the function?