An Anti-Inflammatory Drug Has a Half-Life in the Human Body

Short Answer

An anti-inflammatory drug has a half-life in the human body of about 8 hours.
A. Use the half-life to find the value of k in the differential equation , where Q is the quantity of the drug in the body t hours after the drug is administered. Round to 4 decimal places.
B. After how many hours will 45% of the original dose remain in the body? Round to 2 decimal places.