Answer:
Option b
or 
Step-by-step explanation:
The absolute value is a function that transforms any value x into a positive number.
Therefore, for the function
x> 0 for all real numbers.
Then the equation:
has two cases
if
(i)
if
(ii)
We solve the case (i)

We solve the case (ii)

Then the solution is:
or 
Why yes it is, good question
1. Y=X-4
2. Y=X*4
3. Y=X+3
4. Y=X/6
15.6 kilometers rounded down because it is not safe to go above what has been approved