Malia has saved $18.50 to buy a hamster cage that costs $30. Which equation can she use to find s, the additional amount she needs to save?
18 dollars and 50 cents + s = 30 dollars
s minus 18 dollars and 50 cents = 30 dollars
18 dollars and 50 cents s = 30 dollars
StartFraction s Over 18 dollars and 50 cents EndFraction = 30 dollars
