Which expressions are polynomials? select each correct answer • x/5+2 • 35x^2 •7x^7-x^-5 •4x+square root x-1 . will reward for who knows the answers.

Note:
A polynomial of order n is of the form

where the a's are constants.

Consider the given expressions.
x/5 + 2                  Not a polynomial
35x²                      It is a polynomial of order 2
7x⁷ - x⁵                  It is a polynomial of order 7
4x + √(x-1)             It is not a polynomial

The polynomials are
35x²
7x⁷ - x⁵

60 ÷ -20 x makes x = -3