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OpenStudy (anonymous):
Find the sum of the first 12 terms of the sequence. Show all work 1, -4, -9, -14, . . .
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OpenStudy (anonymous):
\[\sum_{0}^{11}(-5x+1)=-5*\sum_{0}^{11}x+\sum_{0}^{11}1=-5(0+1+2+3+...+11)+12*1=-5(11*12)/2+12=-330+12=-318\]
OpenStudy (anonymous):
Thank you SOOO much
OpenStudy (anonymous):
no problem :)
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