For the given expression:
Recall that a monomial is an algebraic expression that involves multiplications and exponentiations, and is separated from other monomials through a "+" or "-" sign. Then, the given expression has three monomials, which makes it a trinomial.
On the other hand, for polynomials in two or more variables, the degree is equal to the maximum degree among its terms, and the degree of a single term is the sum of the exponents of the variables in the term.
The first term has a degree of 7, the second term has a degree of 3 and the third term has a degree of 6. Then, the degree of the whole trinomial is 7.
Therefore, two options apply for the given expression: