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What aspects of lines have to be diffrent

Use set buikder notation to represent the following set: {, -2, -1, 0}

Anew shopping mall is gaining in popularity. every day since it opened, the number of shoppers is 5% more than the number of shoppers the day before. the total number of shoppers over the first 10 days is 1258 how many shoppers were on the first day?