The answer is no, the side lengths are not persevered. <span />
        
                    
             
        
        
        
The first operation performed while evaluating would be to do the parenthesis
        
             
        
        
        
Step-by-step explanation:
Pyramid
1/2 * 12 * 15 
6 * 15 = 90
90 * 4 = 360cm
Cube
12 * 12 = 144 
144 * 4 = 576cm
576 + 360 = 
936 cm² of paint 
 
        
             
        
        
        
Answer: $7 
Step-by-step explanation: if a stapler cost $3, then 20staplers will cost $60
Amount left will be $200-60=$140
Cost of one organiser will be $140/20
That will be $7
 
        
                    
             
        
        
        
Answer:
x= 500 y= 1500
Step-by-step explanation:
Isolate x or y in the first equation
Isolating for x would be x= -y+2000
Substitute X=-y+2000 into equation 10x+20y=35000
10(-y+2000)+20y=35000
Exapnd the equation above and you should get y=1500
Same steps for finding x by isloating for y