Answer:
A.[tex]x+y-13[/tex]
Step-by-step explanation:
We have to find the expression which is tri-nomial.
Trinomial: It is that expression which contains three terms.
A.[tex]x+y-13[/tex]
It contains three terms .Therefore, it is trinomial.
B.4xyz
It does not contains three terms .Therefore, it is false.
C.[tex]4x^3[/tex]
It does not contains three terms .Therefore, it is false.
D.[tex]x^3-3x^2+7x+5[/tex]
It contains four terms .Therefore, it is not trinomial.
Answer:A.[tex]x+y-13[/tex]