Answer:
8 grams 
Step-by-step explanation:
The balance is in equilibrium, so the weights of the two sides are equal.
Let the weight of a square be s.
Left side: 2s + 4
Right side: s + 3(4) = s + 12
The weights are equal, so we set the two expressions equal.
2s + 4 = s + 12
s = 8
Answer: The weight of a square is 8 grams.
Question 2: The first step was the combine the like terms; in this example he is subtracting the 3x on both sides of the =. 
 
        
                    
             
        
        
        
I believe the answer is “A”
        
                    
             
        
        
        
So i think in the school there may be 4800 in the school. Hope this helps
        
             
        
        
        
Answer:
1) 24         2) $2 per pencil         3) 23        4) 15    5) $5 per eraser
6) 37        7) 16                            8) $16
Step-by-step explanation:
hope this helps
 
        
             
        
        
        
For the triangle, the shaded part, both the height and base are 12, so the area of it is: 
1/2 (12 x 12) = 72
And the area of the whole square is 144
But what we’re looking for is the area of the unshaded region. So to find it, we’ll need to subtract the shaded from the total. So:
144 - 72 = 72
Thus, the area of the unshaded region is 72