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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 (alexwee123):
sn = n(t1 + tn)/2
OpenStudy (alexwee123):
n= number of terms t1=first number tn=last term(which would be the 12th number of the sequence)
OpenStudy (alexwee123):
and if you dont know how to find the first and 12th then use the arithmetic sequence formula |dw:1336344186624:dw|
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