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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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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Using an arithmetic sequence that follows the formula: \(a_n =a_1 +(n1)d\)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0\[\large a_{\color{red}{n}} = a_{\color{red}{18}}\] 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=?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Perhaps 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.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0That'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.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0And 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

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0This 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.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0No problem and good luck!
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