Answer:
x/3 -3= 18 (add three to both sides)
x/3= 21
x/3(*3) =21(*3) (multiply by 3 on each side to cancel out the division)
x= 63
63/3-3=18
21-3=18 
18= 18 (checking answers)
Step-by-step explanation:
 
        
             
        
        
        
Answer:  
I would think 15c+5= 35 because it is the one answer that makes the most sense.  If you get this wrong I am so sorry. 
 
        
                    
             
        
        
        
Answer:
D) What is the number of gallons of water in a pool?
Step-by-step explanation:
A statistical question consists of varied responses and not just 1 specific answer. For example, the first 3 questions only have 1 specific answer each, while the last question can vary depending on the size of the pool.
 
        
                    
             
        
        
        
Hope this helps! I can resubmit if my hand writing is too bad.