SOLUTION: Determine the 31st term of the arithmetic sequence:-29;-23;-17;....

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Question 1064860: Determine the 31st term of the arithmetic sequence:-29;-23;-17;....
Answer by Boreal(15235) About Me  (Show Source):
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It is a1+ (n-1)d, where a1=-29, n=31, and d=6
a31=-29+(30)*6=151
terms 4-6 are -11,-5,1
There are 25 more terms, each 6 apart, for a sum of 150. Added to the 1 gives 151.