Domain, in math terms, is the set of possible x values. This changes with your function. f(x)=x, for example, has a domain of negative infinity to infinity. However, f(x)=squareroot of x can only be positive, as otherwise it would go to imaginary numbers. Hence, its domain is 0 to inifinity.
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Domain is the independent variable in an equation. It is what you put "in" the equation to get the Range.
A math expression is a collection of math terms
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The word is used in the context of sets and mappings. A mapping is a relationship between two sets. To each element in one set, the domain, the mapping allocated one element in the other set, the co-domain or range.
It means kilo meter is a math term for meters