Hello, I need some clarification for my answers, thanks!

Question

1. What is the degree of the monomial?
A. 5
B. 12***
C. 17
D. 60

2. What is the degree of the monomial?
-2
A. -2
B. -3
C. 0***
D. -1

What is the sum or difference?
3.
2x^4 - 8x^4
A. -6x^8
B. -6x^4***
C. -16x^4
D. -16x^8

What is the sum or difference?
4.
5y^4 - 9y^4

A. -45y^4
B. 14y^4
C. -4y^4***
D. -4y^8

5. Write the polynomial in standard form, then name the polynomial based on its degree and its number of terms.

2 - 5x^3 + 6x
A. 2 - 5x^3 + 6x; not a polynomial
B. -5x^3 + 6x +2;cubic-trinomial***
C. -5x^3 + 6x + 2;quadratic-trinomial
D. 6x - 5x^3 + 2;fourth-degree-trinomial(X) (No such term.)

These are what I have so far. I will update my post as I answer the questions.

Answer 1

#1 has no monomial...
the rest look good.

Answer 2

Sweet! I apologize, the problem is here for one.
5x^12

Answer 3

then your are right here, too.
good work