General agencies, such as Dun and Bradstreet, collect information on a range of business enterprises nationwide, while special agencies limit their coverage to one or a few business areas and may operate either nationally or locally.
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No. A relation is not a special type of function.
In general the function and it inverse are not the same and do not have the same graph. If we look at a special function f(x)=x, it is equal to its inverse and the graph is the same. Think of the inverse of a function as changing all the x's to y's and vice versa. Well, in the function f(x)=x, all the x's are already y's and vice versa so it is its own invese.
Functions are special types of relations.
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A relation has pairs of numbers. A function is a special relation where for each input there is one and only one output.