# SOLUTION: please help me solve this challenge question on arithmetic sequences: if the 9th term of an arithmetic sequence is 27 and the 25th term is 123 what is the first term of the sequenc

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 Algebra: Sequences of numbers, series and how to sum them Solvers Lessons Answers archive Quiz In Depth

 Question 522593: please help me solve this challenge question on arithmetic sequences: if the 9th term of an arithmetic sequence is 27 and the 25th term is 123 what is the first term of the sequenceAnswer by Maths68(1474)   (Show Source): You can put this solution on YOUR website!nth term formula of an arithmetic sequence = Substitute the values in nth term formula ....................(1) and Substitute the values in nth term formula ...................(2) Subtract (1) from (2) ----------------- Plug in the value of d in (1) First term of the given sequence is -21