Respuesta :

Answer:

9n

Step-by-step explanation:

5n + 4n

Factor out n

n(5+4)

n (9)

9n

Answer:9n

Step-by-step explanation:

To simplify this expression

5n+4n

Factorise the expression

n(5+4)

n(9)

9n

or

5n+4n

=9n