If the question is how many shelves are needed, then the answer is 18 shelves.
Answer: 4
Step-by-step explanation: 2 + 2 = 4
144
If you add 9+6+9 is will give you 24 than you would times that by 6. So 9+6+9= 24 next 24×6=144.
-18+4x
2(2x-9)
4x=18
-4x=-18
x=18/4
-x=-18/4
