The amount of a certain medication in a patient's bloodstream is given by , where is the amount in milligrams and is the number of hours after the medication was administered. What is the best interpretation of in this context?
The medication's effectiveness lasts for 50 hours.
The patient needs 50 milligrams of medication per hour.
The initial amount of medication administered was 50 milligrams.
After 50 hours, the amount of medication is 0.7 milligrams.
