Answer: B, Each of the sums is 180 degrees.
Step-by-step explanation:
Since a 180 degree angle is always a flat line, and that is the case for this, 
Each of the sums is 180 degrees.
 
        
                    
             
        
        
        
Answer:
Step-by-step explanation:
<u>3/4 left and 1/7 of that eaten:</u>
- 3/4 - 3/4(1/7) = 
- (3/4) (1 - 1/7) = 
- (3/4)(6/7) =
- 18/28 = 
- 9/14
 
        
                    
             
        
        
        
Answer:
6.9
7.-5
8.-10
Step-by-step explanation:
 
        
             
        
        
        
i can help if you have the picture
 
        
                    
             
        
        
        
r - 4/5r  =  1/5r + 1
Subtract  1/5r from each side:    r - 4/5r - 1/5r  =  1
Combine all the 'r' terms on the left side:  
                                 r - 5/5r  =  1
                                 r  -  r  =  1
                                       0  =  1
There is no value of 'r' that can make ' 0 = 1 ' a true statement.
So the equation has <em>no solution</em>.