Find the 25th term of the arithmetic sequence where a1 = 8 and a9 = 48?

nikakede

nikakede

Answered question

2022-09-10

Find the 25th term of the arithmetic sequence where a1 = 8 and a9 = 48?

Answer & Explanation

Sugainkohr

Sugainkohr

Beginner2022-09-11Added 13 answers

the n th term of an arithmetic sequence is
x a n = a 1 + ( n - 1 ) d
where d is the common difference
given a 1 = 8 then
a 9 = 8 + 8 d = 48 8 d = 40 d = 5
a 25 = 8 + ( 24 × 5 ) = 128

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