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What is monomial? What is Polynomial?

Monomial has only one term with the product of a number and a variable, such as, -3x. Monomial can be the product of different variables and the variable has only integer exponent, such as (1/2)xy2 or -x2y3. Monomial can be a number or a variable, such as, 7 or x. Monomial requires the variable to have only positive integer exponent.