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A box of pencils costs $10.The total cost (c) as a function of the number of boxes (b) is expressed as c = f(b) = 10b. What is the domain of this function?

Sagot :

The domain of this function is N, because the number of boxes can only be positive integers (you cannot have 1,3 boxes or -2 boxes).
So 10b should be part of N too.