Answer: 9x
Step-by-step explanation:
When adding X you simply add the numbers in front of X.
3+3+3=9 so you have 9x
think of it as this. If you have 3 apples and add 3apples and then 3 more appls. How many apples are there
3 apples+ 3 apples+ 3 apples= 9 apples
