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bezimeni [28]
2 years ago
7

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

Mathematics
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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