anonymous
  • anonymous
Find the indicated nth partial sum of the arithmetic sequence. 1.4, 4.6, 7.8, 11, ..., n = 100 A. 7250 B. 16300 C.15980 D.15981.8 E. 15978.2
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
Hi, The common difference is (4.6-1.4)=3.2. The 100th term is 1.4+(100-1)*3.2=318.2. The sum of the first 100 terms is then 100/2*(1.4+318.2)=15980.
anonymous
  • anonymous
Oh ok thank you very much!
anonymous
  • anonymous
You're welcome!

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