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OpenStudy (anonymous):
find the the first term in the arithmetic series Sn = 781, d = 3, n = 22
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OpenStudy (anonymous):
find an
OpenStudy (anonymous):
an = sn - sn-1
OpenStudy (anonymous):
?? more help pluz
OpenStudy (anonymous):
(a1+ a1+ 21·3)·22/2= 781 --> (2a1+63)= 71 --> 2a1=8 --> a1=4
OpenStudy (anonymous):
thanks!!!!!!!!
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