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OpenStudy (anonymous):
What is the sum of the arithmetic sequence 174, 168, 162 …, if there are 31 terms?
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OpenStudy (campbell_st):
a = 174, d = - 6 n = 31 substitute into \[s _{n} = n/2(2a + (n - 1)d)\]
OpenStudy (cwrw238):
a = 174, d = -6, n = 31 sum of 31 terms = (31/2)[2*174 + (31-1)*-6]
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