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Find the 20th term of the arithmetic sequence 15,9,3,-3

Find the 20th term of the arithmetic sequence 15,9,3,-3
asked 9.1k views
10 votes
Find the 20th term of the arithmetic sequence 15,9,3,-3

asked
User Usagi
by
8.6k points

1 Answer

9 votes

Answer:

-99

Explanation:


a = 15 \\ d = - 6 \\ {n}^(th) term = a + (n + 1)d = 15 + (n - 1)( - 6) \\ {20}^(th) term =15 + (20 - 1)( - 6) = 15 - 114 = - 99

answered
User John Deters
by
7.8k points
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