18 Given: the sequence 4, 7, 10, 13,...
       
      
                
     
    
    
    
    
    2 answers:
            
              
              
                
                
a₁ = 4
n = 10
d = 3
a = a₁ + (n - 1)d
a₁₀ = 4 + (10 - 1)3
a₁₀ = 4 + (9)3
a₁₀ = 4 + 27
a₁₀ = 31
The 10th term would be 31 and the d variable will be replaced with the number 3.
 
                                
             
                    
              
              
                
                
The answer is d because a=31
                                
             
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