Answer:
i think... x=6
Step-by-step explanation:
3x+9=x+21
3x−x=12
2x=12
x=6
Answer: 12 inches cubed
volume=length x width x height
volume=1.5 in x 2 in x 4 in
volume=12 in^3
As it ایس the correct answer is 45
78
7.90
Can you add a picture?
