Which expressions are polynomials?

Select each correct answer.

35x^2

Step-by-step explanation:

the first one is not b/c its x/5

the second one is not b/c has a square root

the last one it has negative exponents

Step-by-step explanation:

By definition, the power of each term in a polynomial must be greater than or equal to 0.

So x/5+2 is a polynomial

4x+sqrt(x)-1 is not because sqrt(x) is x^(1/2)

35x^2 is a polynomial

7x^7-x^(-5) is not because -5 is less than 0.