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OpenStudy (agentnao):
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 (angela210793):
a12=a1+(n-1)*d 13=a1+11*(-10) 13=a1-110 a1=123 Sn=(a1+a12)*12/2=(123+13)*6=816
OpenStudy (agentnao):
Thank you! You really are a superhero :)
OpenStudy (angela210793):
lol..no I'm not :) and yw :D
OpenStudy (akshay_budhkar):
angela your level tells it.. YOU ARE A SUPERHERO!
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