Question

What should be added to10 so that the sum becomes -21

Answer 1

Answer:

-31 + 10 = -21

Step-by-step explanation:

Hope it helps <3

Brainlist plz mate

Answer 2

Step-by-step explanation:

Let the unknown no be x.

hence,    10+x= -21

                  x= -21-10

                  x= -31.