What is the formula for the following arithmetic sequence? -9 , -2 , 5 , 12
       
      
                
     
    
    
    
    
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You add 7 to get the next number in the sequence:
-9 + 7 = -2; -2 + 7 = 5; 5 + 7 = 12; and so on.
                                
             
                    
              
              
                
                
First term:  -9
Common difference:  7
a(n) = -9 + 7(n-1), for n = {1, 2, 3, ... }
Check:  what is the first term?  let n=1.   Then a(1) = -9 + 7(1-1) = -9.  
This is correct.
                                
             
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5. m<1 = 114 degrees
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<em>Hope that helps!</em>
<em>-scsb</em>
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