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Mathematics 7 Online
OpenStudy (anonymous):

What is the sum of a 12–term arithmetic sequence where the last term is 13 and the common difference is –10?

OpenStudy (experimentx):

110+13 = 123 ... that will be your first term.

OpenStudy (experimentx):

and the sum will be 12/2 x (first term + last term) = 6 x (123+13)

OpenStudy (anonymous):

got ittt !!! :) 816!!!

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