Respuesta :

Answer:

-4+(-9)

Step-by-step explanation:

-4-9=-13 and-4+(-9)=-13

which means they're equivalent to each other

-4-9 =-13

4-9=-5

-4+(-9): +positive sign and -negative sign=- negative sign

-4-9=-13

-4+9=5

4+9=13

Answer:

-4+ (-9)