Answer:
length of each side : 10 cm
Step-by-step explanation:
all sides of squares are equal 
thus, 4 sides = 40 cm
1 side = 40/10 cm
1 side = 10 cm
 
        
                    
             
        
        
        
Answer:
18-4s
Step-by-step explanation:
15+3-4s
You just simplify to get 18-4s.
Hope that helped!
 
        
             
        
        
        
Answer:
A
Step-by-step explanation:
 
        
             
        
        
        
Answer:
9 gallons of water per minute
Step-by-step explanation:
First identify what you know:
1) The pipe was flowing water for eight minutes.
2) In that eight minutes, 72 gallons of water came out.
So, if 72 gallons of water came out in eight minutes, how many gallons flowed out in a single minute? Well, assuming that the flow rate was consistent, then simply divide the total number of gallons that flowed out, by the number of minutes the pipe was open!
72/8 = 9 
The pipe released 9 gallons of water per minute, thus resulting in 72 gallons of water in 8 minutes! 
Hope this helps! :)