Answer:
150
Step-by-step explanation:
Each square on a cube is 5 by 5 meters long.
The area of each square is 5 * 5, which is 25 square meters.
There are 6 sides on a square, so multiply 25 by 6, and you will get 150.
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4(3+x)
This is because 4*3=12 and 4*x is 4x so you get 12+4x which is the original equation