7. Find S 14 for the arithmetic sequence. 101+98+95+92+..

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Mathematics Huyền Thanh 3 years 2021-08-24T05:15:00+00:00 2021-08-24T05:15:00+00:00 1 Answers 8 views 0

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Captcha* Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )

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kiet · Answer 1 · 2021-08-24T05:16:54+00:00

kiet

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2021-08-24T05:16:54+00:00 August 24, 2021 at 5:16 am

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Step-by-step explanation:

$S _{n} = \frac{n}{2} (2a + (n - 1)d) \\ S _{14} = \frac{14}{2} ((2 \times 101) + (14 - 1) \times -3) \\ =1,141$