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How do you determine if ##-2/3## is a monomial?
##-2/3## is a monomial.
A monomial is product of non-negative integer powers of variables. It has no negative or , though it may have constants. It has just one term.
Examples are ##5x##, ##-13y##, ##6/5xy##, ##7x^2y##, ##-3x^3yz^4## or even the constant terms like ##5##, ##-7/2## or ##-2/3##.
Hence ##-2/3## is a monomial.