MathOverflow is a question and answer site for professional mathematicians. It only takes a minute to sign up.
Sign up to join this community
Anybody can ask a question
Anybody can answer
The best answers are voted up and rise to the top
The presence of medicine for reducing high blood pressure decreases at the rate of 29% per hour in a patient’s bloodstream. This medicine is effective until the amount in the bloodstream drops below 1.2mg. How long will a dose of 75mg be effective?