I need help with 15-20, I’m dumb brain

Answer:
1, 3, 2, 0, 5, 4
Step-by-step explanation:
The degree of a polynomial is determined by the value of the largest exponent of the variable within the polynomial.
15
9x + 2 = 9[tex]x^{1}[/tex] + 2
largest exponent of the variable is 1 , hence degree 1
16
6x³ - 5
largest exponent of the variable is 3, hence degree 3
17
4x² + 6x
The exponent of 4x² is 2 and 6x is 1
largest exponent of the variable is 2, hence degree 2
18
4 = 4[tex]x^{0}[/tex] ← degree 0
19
4[tex]x^{5}[/tex] +6x³ - 9
largest exponent of the variable is 5, hence degree 5
20
- 14x² + 3x - 6[tex]x^{4}[/tex]
The values of the exponents are 2, 1 and 4
largest exponent is 4, hence degree 4