To be effective, a certain drug must not drop below 25 mg in the body. An intravenous injection containing 200 mgs of that drug was administered to a patient. How much time will it take for that drug to reach the 25 mg minimum level. The drug's half-life is 30 minutes.

An engineer decides to use a slightly weaker material rather than a stronger material, since she knows that the stronger material can break suddenly. this is an example of what? a choosing a material that will show warning before it fails b using composite materials that combine strength c using a material for multiple applications d using design techniques that increase efficiency and reduce cost