Question
Justin jogged for 4 days. On each day, he would do 10 more rounds than the previous day. He did d number of rounds on the first day. What was the total number of rounds he did for the 4 days? Give your answer in terms of d.
2 m

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Justin jogged for 4 days. On each day, he would do 10 more rounds than the previous day. He did d number of rounds on the first day. What was the total number of rounds he did for the 4 days? Give your answer in terms of d.