Answer:
12
Step-by-step explanation:
 
        
             
        
        
        
Answer:
Step-by-step explanation:
p and h are number of plumbers and helpers, respectively.
Twenty workers earn a total of $2600
p+h = 20
h = 20-p
160p + 100h = 2600
160p + 100(20-p) = 2600
60p = 600
p = 10
h = 20-p = 10
Ten plumbers and ten helpers. 
 
        
             
        
        
        
Obtuse angles are more than 90° and less than 180°
        
                    
             
        
        
        
Answer: The answer is (B)
Step-by-step explanation:
It just took the unit test