Answer:
5th degree polynomial
Explanation:
The degree of a polynomial is the highest sum of the exponents in one term.
So we have the polynomial:

Calculate the degree of each term:
1st Term:

This is the same as:

So, our degree is 1+4=5.
2nd Term:

There is only one variable. So, the degree is 3.
3rd Term:

This is the same as:

So, this is a zeroth degree.
The largest degree is 5.
So, this is a fifth degree polynomial.
Notes:
To be more specific, this is a fifth degree trinomial.