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OpenStudy (anonymous):
What is the sum of the arithmetic sequence 22, 13, 4 … if there are 28 terms?
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OpenStudy (cwrw238):
sum n terms = (n/2)[2a + (n-1)d] n = no. terms, a = ist term and d = common difference
OpenStudy (anonymous):
n=28 ,a=22,d=-9, ________________________ now subs. in the following rule sum n terms = (n/2)[2a + (n-1)d]
OpenStudy (anonymous):
thnksss!
OpenStudy (anonymous):
your welcome :) ,any time ..
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