Asked by Sisipho
The 7th and 13th term of an arithmetic sequence are 51 an 15 respectively. which term of the sequence is equal to -21
Answers
Answered by
Steve
the 13th term is six terms away from the 7th, so
7d = 15-51 = -36
Now you know that the terms drop by 36 every 7 terms.
Since -21 = 15-36, there are 7 more terms, so the 20th term is -21
7d = 15-51 = -36
Now you know that the terms drop by 36 every 7 terms.
Since -21 = 15-36, there are 7 more terms, so the 20th term is -21
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.