Answer:
B.) 
Step-by-step explanation:

A negative and a negative equals a positive. Remove parentheses and simplify

Done.
Answer:
-6
Step-by-step explanation:
(1-3)(1+2)=-2*3=-6
Answer:
D or A
Step-by-step explanation:
Answer:
837,000
Step-by-step explanation:
If a number is above 5 round up, if it is below 4 round down