(1 point) Warfarin is a drug used as an anticoagulant. After administration of the drug is stopped, the quantity remaining in a patient's body decreases at a rate proportional to the quantity remaining. Suppose that the half-life of warfarin in the body is 37 hours. Write a differential equation satisfied by Q: dQ dt (Your equation should not involve any undetermined constants.) How many days does it take for the drug level in the body to be reduced to 35 percent of its original level? time= (include units)