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OpenStudy (anonymous):
What is the sum of a 12-term arithmetic sequence where the last term is 13 and the common difference is -10
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OpenStudy (anonymous):
810
OpenStudy (anonymous):
are you sure its not 816?
OpenStudy (anonymous):
a12=a1+11d 13=a1+(-110) a1=123 S=6(123+13) =816
OpenStudy (anonymous):
oky thats what thought, thank you !
OpenStudy (anonymous):
yw
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OpenStudy (anonymous):
oh sorry.i forgot to add 6 at the last step of my calculation!!
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