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OpenStudy (anonymous):
What is the sum of a 30-term arithmetic sequence where the first term is 72 and the last term is -102? A. -480 B. -450 C. -420 D. -390
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OpenStudy (aravindg):
sum =n/2(first term +last term)
OpenStudy (aravindg):
Here n=30 .You know the first and last terms
OpenStudy (anonymous):
30/2*72+-102?
OpenStudy (anonymous):
-450 :D
OpenStudy (anonymous):
Thats what I got! Thanks!
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OpenStudy (anonymous):
anytime :)
OpenStudy (aravindg):
yw :)
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