
Mark M. answered 04/26/21
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Mathematics Teacher - NCLB Highly Qualified
a25 = 5 + 24d
115 = 5 + 24d
110 = 24d
55 / 12 = d
S20 = (20/2)(2(5) + 19(55 / 12))
Alyssa D.
asked 04/26/21For an arithmetic sequence with a1=5 and a25=115, find the sum of the first 20 terms.
Mark M. answered 04/26/21
Mathematics Teacher - NCLB Highly Qualified
a25 = 5 + 24d
115 = 5 + 24d
110 = 24d
55 / 12 = d
S20 = (20/2)(2(5) + 19(55 / 12))
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