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 one year ago
How do I do this problem?
n an
1 1
2 6
3 11
4 16
When n equals 8, what does an equal?
 one year ago
How do I do this problem? n an 1 1 2 6 3 11 4 16 When n equals 8, what does an equal?

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wio
 one year ago
Best ResponseYou've already chosen the best response.2You can tell it's an arithmetic sequence because \[ \large a_{n+1} a_n=5 \]

wio
 one year ago
Best ResponseYou've already chosen the best response.2Arithmetic sequences have the form: \[ a_n = a_1 + (n1)d \]

wio
 one year ago
Best ResponseYou've already chosen the best response.2In this case \(d = 5\) and \(a_1=1\), so our equation is \[ a_n = 1 + (n1)5 \]

ParthKohli
 one year ago
Best ResponseYou've already chosen the best response.0But that is not the question... your formula is:\[a_n = a_1 + (n  1)d\]The \(d\) was stated by @wio: \(5\).

wio
 one year ago
Best ResponseYou've already chosen the best response.2So you want to substitute \(n=8\) into the equation to find \(a_8\).

ParthKohli
 one year ago
Best ResponseYou've already chosen the best response.0So, the formula is:\[a_n = 1 + 5(n  1)\]Now substitute \(n = 8\).

AGummiBear55
 one year ago
Best ResponseYou've already chosen the best response.0So the answer would be 36, correct?

AGummiBear55
 one year ago
Best ResponseYou've already chosen the best response.0:D Thank you both, yall were A LOT of help!! <3
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