Degree
A polynomial's degree is simply its highest exponent.
So, to find the degree of this polynomial, we should find its highest exponent.
Given polynomial:

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The first term has an exponent of 10.
The second term has an exponent of 9.
The third term has an exponent of 3.
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The first term has the highest exponent, which is 10. Therefore, 10 is the degree of this polynomial.