what must be added to -9 to get 20?​

Sagot :

Answer:

29

Step-by-step explanation:

-9 plus 29 is equal to 20

29 is the answer.

Explanation:

Let x be the number.

-9 + x = 20

x = 20 + 9

x = 29

Let's do the checking.

-9 + x = 20

-9 + (29) = 20

20 = 20

Therefore, the solution is true.