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

asked Feb 9, 2023 9.1k views

10 votes

by Usagi

3.6k points

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9 votes

Answer:

-99

Explanation:

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

John Deters answered Feb 15, 2023

3.6k points

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