Hello!
Let's take a look at the information that the question includes:
Ariana begins with $120,000,000 and spends $18,000 on remodeling her house.
In order to find how much money she has left, we must subtract the money she spends from her original amount:
120,000,000-18,000=
The answer to your question is:
119,982,000
Ariana has $119,982,000 left.
I hope this helps you! Feel free to comment or PM me if you have any additional questions. Have a great day!