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Mathematics 8 Online
OpenStudy (anonymous):

Find S25 for -7+ -2 + 3 + 8 +…

OpenStudy (amistre64):

since the numbers remain fairly small, its prolly a common adder that they are using to create the sequence with. would you agree?

OpenStudy (amistre64):

next term, equals the last term plus 5. seems to work

OpenStudy (amistre64):

-7-5 = -12 sooo \[\sum_{n=1}^{25}(-12+5n)\]

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