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The difference of 2 numbers is 21 and the quotient of the equation is 4 then what are the two numbers?

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

The following frequency table relates the weekly sales of bicycles at a given store over a 42-week period.value01234567frequency367108521(a) in how many weeks were at least 2 bikes sold? (b) in how many weeks were at least 5 bikes sold? (c) in how many weeks were an even number of bikes sold?