Respuesta :
Answer:
Zero
Step-by-step explanation:
it is to correct answer because I did this before and one of my classes also subscribe to my channel bye
The answer is zero
4-4=0
13-(-7)=20
And since there is no number above the 20 it is zero
4-4=0
13-(-7)=20
And since there is no number above the 20 it is zero