NEED HELP WITH THIS ASAP(POLYNOMIALS) Identify if its a polynomial or not
1. -45

2. 2/x

3. 5 + 3x^2

4. 8 + y

5 2x^2 + xy + y^3

6. 3a^3 - 4a^2 - 5

7. x^2/12

8. -m^2 - 4m + 9

9. 9a^5b^4 + 3a^3b^2 + 8

10. 14a^2b^3c^3d^4

11. 8x^3 - 5x^2 + 3

12. 15/x^2 + 3x

13. -10a^2b^7 + 3c

14. 2m^3 - 2m + 3

15. x^3 + 3y^3 + z^3

Tell whether if its a monomial binomial or trinomial