1) The document defines polynomials as expressions that can be written as the sum of one or more monomials. A monomial is the product of a number, variable, and nonnegative integer powers.
2) The degree of a monomial is the sum of the exponents of its variables. The degree of a polynomial is the highest degree among its monomial terms.
3) Polynomials are classified by degree, with linear having degree 1, quadratic degree 2, cubic degree 3, and so on. Basic arithmetic with polynomials involves combining like terms.