
Dylan B.
asked 04/22/21Find S18 if a= 234 and a25= -30
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1 Expert Answer

Mark M. answered 04/23/21
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Mathematics Teacher - NCLB Highly Qualified
a25 = a1 + (24)d
Determine d
a18 = a1 + 17d from above
S18 = (18/2)(2a1 + 17d)
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Mark M.
Is this a arithmetic or geometric series? Is a the first term?04/23/21