Answer:
12
Step-by-step explanation:
i think that is right 
 
        
                    
             
        
        
        
Answer:
1b
2b
3a
Step-by-step explanation:
 
        
             
        
        
        
Answer:
32.5cm squared
Step-by-step explanation:
((4+9)/2)·5=32.5
 
        
             
        
        
        
2(b-5)+7b-4 
Solve 2(b-5) to get 2b-10
Combine your like terms 2b-10+7b-4
Solve 2b+7b to get 9b
Solve -10+(-4) to get -14 
So your answer is 
9b-14
 
        
        
        
Answer:
3/4
Step-by-step explanation:
Difference means subtraction
12/8 - 3/4
We need a common denominator of 8
12/8 - 3/4 * 2/2
12/8  - 6/8
  6/8
Divide by 2 in the numerator and denominator
  3/4