Respuesta :

hi

X - (-Z) =  X + -1* -Z

           =  X + Z

         

If X = -8  and  Z = -11

so X+Z =  - 8 + (-11)

           =   -8-11

           = -19

first substitute the x and z values with their corresponding numbers:
-8-(-11)
then distribute the -(-11):
-8+11
then subtract 8 from 11 to get 3:
11-8=3