Which expressions are monomials?
A. -4+6
B. b+2b+2
C.(x – 2x)^2
D. rs/2
E. 36x^2yz^3
F. a^x
G. x^1/3

Monomials are the expressions with one terms.

A.) [tex]-4+6 = 2[/tex]

Since, it has only one term. Therefore, it is a monomial.

B.) [tex]b+2b+2 = 3b+2[/tex]

Since, it has two terms. Therefore, it is not a monomial.

C.) [tex](x-2x)^2 = (-x)^2=x^2[/tex]

Since, it has only one term. Therefore, it is a monomial.

D.) [tex]\frac{rs}{2}[/tex]

Since, it has only one term. Therefore, it is a monomial.

E.) [tex]36x^2yz^3[/tex]

Since, it has only one term. Therefore, it is a monomial.

F.) [tex]a^x[/tex]

Since, the variable is in the power. So it is not a monomial.

G.) [tex]x^\frac{1}{3}[/tex]

Since, the power is not a integer. Therefore, it is not a monomial.