Question

1. (5m + 3n) + (4m - 6n)
A. 9m + 9n
B. 9m - 3n
C. 9m + 3n
D. 13mn
2. Multiply: (x + 1)(x - 2)
A. x2 - 2
B. 2x - 2
C. x2 - 2x - 2
D. x2 - x - 2

Answer 1

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

Answer 2

1 is C because you have to add 5m and 4m then you subtract 3n and 6n , and because it says to add them you have to put the addition sign between the two.