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OpenStudy (ally_b):
Please help?!? Find the sum of the first 12 terms of the sequence. Show all work for full credit. 1, -4, -9, -14, . . .
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OpenStudy (anonymous):
what king of sequence do u think this is?
OpenStudy (ally_b):
Arithmetic
OpenStudy (anonymous):
correct, so now what is ur common difference
OpenStudy (ally_b):
-5
OpenStudy (anonymous):
meaning what do you add or substract to get the next number?
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OpenStudy (anonymous):
ok correct
OpenStudy (anonymous):
now u can add -5 to -14 and so on untill you get 12 terms and then add them all up, or use the Sn formula
OpenStudy (anonymous):
you there?
OpenStudy (ally_b):
ok thanks!
OpenStudy (anonymous):
np
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