22 I think If I worked it out right
Answer: 0.42 mg
Step-by-step explanation:
Given : A 3mL unit dose of levalbuterol HCl contains 0.63mg of active ingredient.
Then , the amount of active ingredient in 1 ml dose of levalbuterol HCl = 

Hence, the amount of active ingredient in 2 ml dose of levalbuterol HCl will be :-

Hence, the amount of active ingredient in 2 ml dose of levalbuterol HCl =0.42 mg
Answer:
C
Step-by-step explanation:
Im not sure but 4,6,7,8,9
2 3/4a=9 1/4
2.75a= 9.25
cross off 2.75 and a will remain
divide 9.26 and 2.75
so a=3.36363636
a=<span>3.36363636
but you can round it to a=3.4ish i guess</span>