Respuesta :

Answer:

x=20

Step-by-step explanation:

Answer:1. (5m + 3n) + (4m - 6n)

=9m - 3n ...combine like terns

answer is 

B. 9m - 3n

2. Multiply: (x + 1)(x - 2)

=x^2 +x -2x - 2

=x^2 -x - 2

answer 

D. x2 - x - 2 hopes this helps