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OpenStudy (anonymous):
What is the sum of a 28-term arithmetic sequence where the first term is 12 and the last term is 255?
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OpenStudy (anonymous):
Formula: Sn = n(a1 +an)/2 So, \[S28= 28 ( 12 +255)/2\] Simplify
OpenStudy (anonymous):
3318
OpenStudy (anonymous):
2,937 3,204 3,471 3,738
OpenStudy (anonymous):
@TwinYang
OpenStudy (anonymous):
You didn't simplify correctly, simplify again.
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OpenStudy (anonymous):
got the same thing
OpenStudy (anonymous):
Simplify 12+255 to 267 x=28×267/2 2 Simplify 28×267 to 7476 x=7476/2 3 Simplify 7476/2 to 3738 x=3738
OpenStudy (anonymous):
oh thank you!
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