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OpenStudy (anonymous):
What is the sum of a 14–term arithmetic sequence where the last term is 30 and the common difference is –5? What formula do i use?
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OpenStudy (anonymous):
sum of AS = (1/2) (first term + last term)(no. of terms) last term = 30 first term= 30-(-5)(14-1) no. of term=14
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