38. A 50-mL vial containing 5 mg/mL of the drug alteplase is added to 100 mL of DSW and administered intravenously with an infusion set that delivers 15 drops/mL. How many drops per minute should be given to administer 25 mg of the drug per hour? Round your answer to the nearest WHOLE number.39. If the loading dose of phenytoin in children is 20 mg/kg to be infused at a rate of 0.5 mg/kg/min, over how many minutes should the dose be administered to a 32-lb child?42. At what rate, in drops per mi