A patient is to be started on 150 milligrams of medication that is then decreased by 10% of the original dose for each dose until he is receiving 75 milligrams. When he
takes his 75 milligram dose, how many total doses will he have taken? HINT: Be sure
to count his first (150 milligrams) and his last (75 milligrams) doses.

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.