Answer:
A
Step-by-step explanation:
This is because 6f+f is just 7f. 
f f f f f f+f = fffffff
Soooo, ONLY A gives us 7f when added together again. 
f+5f+f=7f. 
f+ f f f f f +f = fffffff
 
        
                    
             
        
        
        
Answer:
D
Step-by-step explanation:
 
        
             
        
        
        
The answer would be 
3x² - x + 3
        
                    
             
        
        
        
They took $10 from 10 people that saw and wanted to try the ad.