Exam-Style Question on Sequences

A mathematics exam-style question with a worked solution that can be revealed gradually

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Question id: 425. This question is similar to one that appeared on a GCSE Higher paper in 2017. The use of a calculator is allowed.

The first five terms of an arithmetic sequence are:

$$-20, -17, -14, -11, -8$$

Find an expression for the $$n^{th}$$ term of the sequence.

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Toni B, Australia

Sunday, December 26, 2021

"I'm trying to answer a question in the Arithmetic Sequences for the nth term. Problem is, I've tried three different formats and I still don't have the format right, nor can I guess what it is. When the answer is not a single number, it would be nice to have one example answer for people without subscriptions to see.