17. No, it is a binomial with two unlike terms.

19. Yes, it has one positive number and its exponents and variables are positive.

21. Yes, although the base number is negative the variables and their exponents are positive making it a monomial.

23. Trinomial.

25. Not a polynomial.

27. Not a polynomial.

29. Binomial.

31. Monomial.

33. Not a polynomial.

35. Degree 2.

37. Degree 2.

39. Degree 1.

41. Degree 3.

43. Degree 5.

45. Degree 4.

47. -X^5+X^2-X+25

49. 5x^7-10x^6+3wx^2+6w^3x

51. 7+2x-x^2+5x^3

53. 5xy^4-x^2y^3+3x^3y+y^6

55. False, some polynomials can be binomials or trinomials.

57.

59.

61.

63. 7.

65. 11

67. x/y^3

69. A