What is the explicite to 19,13,7,1,...
       
      
                
     
    
    
    
    
    1 answer:
            
              
              
                
                
19, 13,  7,  1,…
  - 6  - 6  - 6
Something that is explicit to the problem is tat it has a common difference of -6.
a(n) = a₁ + d(n - 1)
a(n) = 19 - 6(n - 1)
a(n) = 19 - 6(n) + 6(1)
a(n) = -6n + 19 + 6
a(n) = -6n + 25
                                
             
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3/6 6/9 9/12 and so on just keep adding 2/3