Answer:
The nurse should administer 2 ml each day
Explanation:
According to the prescription, 12 mg of betamethasone should be given daily for three days.
The prescription also says that betamethasone comes in 6 mg/mL per vial. Therefore, to give 12 mg of betamethasone, 2 vials (each vial having 1 ml) of betamethasone must be administered by the nurse.
