SOLUTION: Find the 29th term in the follwing seqeunce 21,15,9,3

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Question 448007: Find the 29th term in the follwing seqeunce 21,15,9,3
Answer by ewatrrr(24785) About Me  (Show Source):
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Hi

Arithmetic sequence {21,15,9,3,...) d = -6

a%5Bn%5D=a%5B1%5D%2B%28n-1%29%2Ad

a%5B29%5D=+21+%2B%2828%29%2A-6+=+highlight%28+-147%29+