Question 13070
Polynomials is either a monomial(7x) or a sum of monomials.
ex:
monomial= 7x, 3xy
binomial= 5x+3, x+2y

Rational Expresions: an algebraic fraction; it has a numerator and a denominator and it's written in the form {{{a/b}}}
ex.
{{{(a^2-3a-4)/9a(a-2)}}}

Hope I explained it ok!
=)