Answer:
or 
Step-by-step explanation:
we have

step 1
Group terms that contain the same variable

step 2
Combine like terms

step 3
Eliminate parenthesis

step 4
Factor the number 

The answer is a because if you divide 1000 by 2 you get 500 and the other ones you get a decimal.
Answer:
It will go 400 kilometers in 5 hours and 800 kilometers in 10 hours
Step-by-step explanation:
80*5= 400 (in 5 hours)
80*10=800 (in 10 hours)