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Algebra Difficulty 2.0 Junior Prove it Canada

An arithmetic sequence is a sequence in which each term after the first is obtained from the previous term by adding a constant $d$ , called the common difference. For example, the sequence $2, 11, 20, 29, 38$ is an arithmetic sequence with five terms and a common difference of $d = 9$ .

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Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.