The degrees of each polynomial is
4 Degree: not a polynomial
2z Degree: 1
4r²st³ Degree: 3
3xyz² Degree: 2
What is degree of a polynomial
The degree of a polynomial is the highest power of the variable (or variables) in the polynomal expression.
In a polynomial, each term is the product of a coefficient and one or more variables raised to non-negative integer exponents.
The degree of the polynomial is determined by the term with the highest exponent.
In the case of 4, the number is a constant and not a polynomial. For others, the highest degree is written out as above
2z the z has exponent of 1 and usually not written