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If the second term of an arithmetic sequence is -2 and the fourth term is 6, find the seventh term

 Jun 22, 2017
 #1
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We can find the common difference, d, between terms thusly :

 

d  =   [ 4th term - 2nd term ] / [4 - 2]  =  [ 6 - -2] / 2   = [8] / 2  = 4

 

So....the 7th term is given by

 

6 + 3d  = 

 

6 +  3(4)  =

 

6 + 12  =

 

18

 

 

cool cool cool

 Jun 22, 2017

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