anonymous
  • anonymous
How do I do this problem? n an 1 1 2 6 3 11 4 16 When n equals 8, what does an equal?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
You can tell it's an arithmetic sequence because \[ \large a_{n+1} -a_n=5 \]
anonymous
  • anonymous
Arithmetic sequences have the form: \[ a_n = a_1 + (n-1)d \]
anonymous
  • anonymous
In this case \(d = 5\) and \(a_1=1\), so our equation is \[ a_n = 1 + (n-1)5 \]

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ParthKohli
  • ParthKohli
But that is not the question... your formula is:\[a_n = a_1 + (n - 1)d\]The \(d\) was stated by @wio: \(5\).
anonymous
  • anonymous
So you want to substitute \(n=8\) into the equation to find \(a_8\).
ParthKohli
  • ParthKohli
So, the formula is:\[a_n = 1 + 5(n - 1)\]Now substitute \(n = 8\).
anonymous
  • anonymous
So the answer would be 36, correct?
anonymous
  • anonymous
Yes
anonymous
  • anonymous
:D Thank you both, yall were A LOT of help!! <3

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