Respuesta :

Answer:

-n - 9

Step-by-step explanation:

3n and -4n added will just equal to -1n or -n.  Add 1 from -10 to get -9.  Your final answer should be -n - 9.

Answer:

-n-9

Step-by-step explanation:

3n-10+1-4n

(3n-4n)+(-10+1)

-n-9