KingJ
  • KingJ
What is the sum of the arithmetic sequence 8, 14, 20 …, if there are 24 terms?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
S = 2a + (n-1)d Where a = first number in sequence, n is nth term you are looking for and d is the common difference.
anonymous
  • anonymous
sorry, it should be: S = n/2( 2a + (n-1)d)
Mertsj
  • Mertsj
\[s _{n}=\frac{n}{2}(a _{1}+a _{n})\] To find the 24th term use: \[a _{n}=a _{1}+(n-1)d=8+(24-1)6=146\] \[s _{n}=\frac{24}{2}(6+146)\] \[s _{n}=1824\]

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Mertsj
  • Mertsj
There. I think I finally got it right.
KingJ
  • KingJ
THANK YOU
Mertsj
  • Mertsj
yw
anonymous
  • anonymous
|dw:1328989953105:dw|
anonymous
  • anonymous
1848
anonymous
  • anonymous
you put a1=6 but it is 8
anonymous
  • anonymous
|dw:1328990276982:dw|
anonymous
  • anonymous
The correct answer is 1848! Tyy!!

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