The sum of monomials - 7x ^ 2Y, 3x ^ 2Y ^ 2Z, - half XY, 5x ^ 2Y, 0.5xy, - 4x ^ 3 is () A. quintic trinomial B. quintic quaternion C. cubic polynomial D

The sum of monomials - 7x ^ 2Y, 3x ^ 2Y ^ 2Z, - half XY, 5x ^ 2Y, 0.5xy, - 4x ^ 3 is () A. quintic trinomial B. quintic quaternion C. cubic polynomial D

-7x ^ 2Y + 3x ^ 2Y ^ 2Z + (- half XY) + 5x ^ 2Y + 0.5xy + (- 4x ^ 3)
=-7x^2y+3x^2y^2z-0.5xy+5x^2y+0.5xy-4x^3
=-4X ^ 3-2x ^ 2Y + 3x ^ 2Y ^ 2Z select a
Quintic trinomial