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.

pure water does not conduct electricity very well. however, when certain substances are dissolved in water, the solution does conduct electricity. you can make a simple device that shows how well a solution conducts electricity. this device uses a flashlight bulb to indicate how well the solution conducts electricity. the better the solution conducts electricity, the brighter the bulb will glow.

explanation:

b.final