A patient is given a dose of medication. The amount of medication remaining in the bloodstream, in milligrams, is modeled by the function , where is the time in hours since the medication was administered. What is the best interpretation of the statement "" in this context?
The medication is completely gone after 5 hours.
The amount of medication in the bloodstream is decreasing over time.
After 5 hours, there is less medication in the bloodstream than after 4 hours.
The medication's effectiveness is less at 5 hours than at 4 hours.
