Answer:
yes this is true. 
Supplementary angles always add up to 180°.
 
        
                    
             
        
        
        
2. 24-7p=10
 -7p=-14
 p=2
3. x+(x+1)+(x+2)=72
 3x+3=72
 3x=69
 x=23
4. x+(x+2)+(x+4)=48
 3x+6=48
 3x=42
 x=14
7. 40-2x=8
 -2x=-32
 x=16
8. 1/2x+4=12
 1/2x=8
 x=16
        
             
        
        
        
        
Answer:
x=50 y=10
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
Step-by-step explanation:
12: 8,700
13: 42
14: 70,000
15: 5,000,000,000
16: 2,210
17: 34,100
18: 1,650
19: 149
20: 290,000