Answer: u got a course hero account ?
Step-by-step explanation:
 
        
             
        
        
        
There were...
11cards left.
heres why.
they started with 24 cards....
so...
24+8=32
32-12=20
20-9=11
Hope i helped!!! :)
Mark me as brainliest if i helped XD
        
             
        
        
        
Answer:
angles 1 and 2 are supplementary
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer: 5x+16
Step-by-step explanation:
Distribute
2x+12 + 3x + 4
Add like terms 
5x+16