Which of the following is an example of a binomial?

A. 2y
b. 2x + y
c. 2xy
d. none of the above

I believe the answer is B

In the most elementary terms, a binomial is a polynomial of two terms; ie, the sum of two monomials.

B is right. Since a binomial is the sum of two monomials.

To determine if an expression is a binomial, we need to check if it consists of two terms separated by either addition or subtraction. Let's analyze each option:

A. 2y - This is a monomial since it consists of only one term.
B. 2x + y - This is a binomial because it consists of two terms, "2x" and "y," separated by addition.
C. 2xy - This is a monomial because it consists of only one term.
D. None of the above - This option suggests that none of the given options are binomials.

Based on the analysis, option B (2x + y) is the correct answer since it is the only one that satisfies the definition of a binomial.