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Determine which expression is not a monomial

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Monomials and polynomials

A monomial is an expression with only have multiplications , dont have sum or rest.

So therefore A,B and C are monomials ( observation : option B have a - sign, but its not resting, its multiplication by (-1))

Then, only remaining option is D, 5m + 2u

Answer is OPTION D,

becausd 5m + 2u is a binomial

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