I believe the answer is A because its the only one that makes the most sense.
        
                    
             
        
        
        
4(a-2)=3(a+4)
4a-8=3a+12
a=20
        
             
        
        
        
Answer by JKismyhusbandbae: 6n-16
Arithmetic Formula: 
Use the following formula to determine any number in an arithmetic sequence:
an = a1 + d (n – 1)
a1 = the first term.
d = common difference
n = term number
 
        
                    
             
        
        
        
Answer:
I'm pretty sure its C but some please correct me if I'm wrong.