Respuesta :

teayonzaga

Answer:

-12

Step-by-step explanation:

-3 + -9 = 12

hope this helps

imSolly

Answer:

-12

Step-by-step explanation:

-3 + -9

turns into

-3 - 9

Which means on the number line, we start at -3 and move to the left 9 units.

When we move to left on the number line by 9, we are at -12.

Which means -3 - 9 (-3 + -9) = -12