Answer:
the degree of the polynomial is 5
Explanation:

To find out the degree of the polynomial we find out the highest degree of each term.
LEts see the exponent of each term
for 6x^2, exponent is 2, degree is 2
for 7x^3 ,exponent is 3, degree is 2
for 8x^5, exponent is 5, degree is 5
Highest degree of the given polynomial is 5
So the degree of the polynomial is 5