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anonymous
 one year ago
find a_18 when a_1=27, d=6
anonymous
 one year ago
find a_18 when a_1=27, d=6

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Jhannybean
 one year ago
Best ResponseYou've already chosen the best response.1Using an arithmetic sequence that follows the formula: \(a_n =a_1 +(n1)d\)

Jhannybean
 one year ago
Best ResponseYou've already chosen the best response.1\[\large a_{\color{red}{n}} = a_{\color{red}{18}}\] Therefore we can conclude \(n=18\). Let's see..

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0thank you, but i did it the long way, d=6 a_1=27 a_n=?

Jhannybean
 one year ago
Best ResponseYou've already chosen the best response.1Perhaps you can show me how you've solved it?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i did 276=21 216=15 156=9 and so on until i got to a18.

Jhannybean
 one year ago
Best ResponseYou've already chosen the best response.1That's also a good way to go about finding it.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0it cant be 27(181)6.

Jhannybean
 one year ago
Best ResponseYou've already chosen the best response.1And why do you think it cant be?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0and 2754 if i do the negative sign, first answer (453) i did a minus sign

Jhannybean
 one year ago
Best ResponseYou've already chosen the best response.1This is how I solved it.\[a_n = a_{18} \longrightarrow n=18\]\[a_n=27+(181)(6)\]\[a_n=27 102\]\[a_n=75\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0thats why, i forgot the addition sign.

Jhannybean
 one year ago
Best ResponseYou've already chosen the best response.1No problem and good luck!
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