X is equal to -4. Hope I helped. If you want an explanation too I would be glad to provide that .
It would be b. the first ratio is
1kL
----
1000
so you would match up the kL and not know how many regular liters there are.
8kL
-----
x
Can sum1 answer this question cause I also need help on this
Solution:
we have been asked to find
The expression is equivalent to 
we can simplify the given expression as below

Hence the simplified expression , equaivalent to the given expression is 1/2.