Which expressions are polynomials? Select each correct answer. 20x² + y 20x² 20x2+y12 20x2/y

A.  20x² + y and B. 20x² are polynomials.

Step-by-step explanation:

Let's review each of the expressions given to define which are polynomials:

A. 20x² + y

It's a polynomial because all of the variables have integer exponents that are positive .

B. 20x²

It's a polynomial because the variable of this monomial  have integer exponent that is positive .

C. 20x² + y ^1/2

It's not a polynomial because a term has a fraction exponent (y ^1/2).

D.  20x²/y

It's not a polynomial because a term has a negative exponent (y ^-1) and there is a variable in the denominator of a fraction.

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