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axelneel
Group Title
Identify the 42nd term of an arithmetic sequence where a1 = 12 and a27 = 66
 one year ago
 one year ago
axelneel Group Title
Identify the 42nd term of an arithmetic sequence where a1 = 12 and a27 = 66
 one year ago
 one year ago

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axelneel Group TitleBest ResponseYou've already chosen the best response.0
i keep coming up with 126 but my options are 70,72,111,114. PLEASE HELP
 one year ago

RaphaelFilgueiras Group TitleBest ResponseYou've already chosen the best response.1
dw:1372218335949:dw
 one year ago

Jhannybean Group TitleBest ResponseYou've already chosen the best response.1
\[\large a_{n}= a_{1}+(n1)d\]
 one year ago

RaphaelFilgueiras Group TitleBest ResponseYou've already chosen the best response.1
r=3
 one year ago

RaphaelFilgueiras Group TitleBest ResponseYou've already chosen the best response.1
111
 one year ago

RaphaelFilgueiras Group TitleBest ResponseYou've already chosen the best response.1
find r and then just plug in that first equation
 one year ago

Jhannybean Group TitleBest ResponseYou've already chosen the best response.1
\[\large 66 =12+(271)d \]\[\large 66= 12 +26d\]\[\large 78 = 26d\]\[\large d= 3\] \[\large a_{42} = 12 + 3(421)\]\[\large a_{42} = 12 + 123\]\[\large a_{42} = 111\]
 one year ago

axelneel Group TitleBest ResponseYou've already chosen the best response.0
i have no idea what i was doing wrong... but thank you
 one year ago
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