2 years ago

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

1 answer:

kati45 [8]2 years ago

3 0

Answer:

-99

Step-by-step explanation:

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

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