1. The problem statement, all variables and given/known data The concentration of a particular drug in a patient’s bloodstream declines at a rate proportional to the concentration, with constant of proportionality k = 0.2 if time is measured in hours. If the concentration of the drug in the patient’s bloodstream is 10mm/ml (millimoles per milliliter) shortly after the injections, what will the concentration be 12 hours later? 2. Relevant equations 3. The attempt at a solution Just want to know if I set this one up correctly. dC/dt=-kC If I didn't, don't be afraid to rip it apart :D.