Final answer:
The given polynomial 8n² + 5n⁵ is named a 5th-degree binomial because it contains two terms and the highest degree of any term is 5.
Step-by-step explanation:
The polynomial given is 8n² + 5n⁵. To name the polynomial according to the degree and term number, we note that the highest degree of any term in the polynomial is 5, coming from the term 5n⁵. This indicates that the polynomial is of the 5th degree. Since there are two terms in the polynomial, it is also called a binomial. Therefore, this polynomial is referred to as a 5th-degree binomial.