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Mathematics 20 Online
OpenStudy (anonymous):

write in sigma notation this infinite series -5, -10, -15, -20...

OpenStudy (anonymous):

whats sigma?

OpenStudy (anonymous):

-25

OpenStudy (anonymous):

\[\sum_{1}^{n}(-5 - 5(n-1))\]

OpenStudy (anonymous):

ooooo haha ur smart! ☻

OpenStudy (anonymous):

\[-5\sum_{0}^{n} (n)\]

OpenStudy (anonymous):

\[= -5(n)(n+1)/2\]

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