Two polynomials are added and the sum is 3x^2-y+4. For each statement, state weather it is always true, sometimes true or never true. Explain or provide a counter example to justify our answer.
a) both are monomials

b) both include a y-term

c) if there is a x-term in one polynomial, then there must be a x-term in the other

d) both are monomials