It means that it is joined up at the end i.e. there are no gaps in it.
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it means to add sometghiog to anotther
It is not a specific mathematical term. It simply means "put on top of".
As a term of an expression in math, 72w means 7 times w
When using the math term, spread, it means the distance between two numbers. For example, if a football score ends with a score of 25 to 17, the spread is 8.
average means _ + _ = _ then you divide the sum by the amout of #'s in the problem.