Relax

Respuesta :

 - 5 + 10 = 5 ( False )
- 5 - 10 = - 15 ( True )
-5 + ( - 10 ) = - 15 ( True )
-5 - ( - 10 ) = - 5 + 10 = 5 ( False ) ;
The correct answers are b) and c).