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OpenStudy (ashleyisakitty):
Check my answer please :~) What is the sum of the arithmetic series 18Σt-1(5t-4).
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OpenStudy (ashleyisakitty):
I got 1566.
OpenStudy (amistre64):
might need to clarify your notation
OpenStudy (ashleyisakitty):
\[\sum_{t-1}^{18}(5t-4)\]
OpenStudy (amistre64):
5(1) - 4 5(2) - 4 5(3) - 4 ... 5(18)-4 ------- vv -4(18 times) 5(1+2+3+...+18))
OpenStudy (amistre64):
5(18)(19)/2 - 4(18) thats better
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OpenStudy (amistre64):
from 1 to 18 right? if so, its not 1566
OpenStudy (ashleyisakitty):
783?
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