Answer:
-3
Step-by-step explanation:

 
        
             
        
        
        
We are given with an 18 student class that is working a project worked by pairs. Each pair works on a project. In this case, there are 9 teams of 2 individuals working on a single project. Hence for a year or school year, there are 9 projects accomplished each time.
        
             
        
        
        
Answer:
Step-by-step explanation:
First add the shoes and the toys: 63+54 = $117
Second subtract 45 dollars from $117 = 72
Third divide 72 by 9 = 8 weeks
Answer: 8 weeks
 
        
             
        
        
        
The answer would be 
-63x^2y^3
        
             
        
        
        
Answer:
it is the last one ( HE SIMPLYFIED INCORECCT)
Step-by-step explanation:
i took the test