Answer:
comment the question I will try to solve it.....
since half of 18 is 9 and the number more than 18 does not have half less than x.
i guess it is 18.
Find the coordinates of the lines and substitute in the distance formula
Could you please provide more information?! I would love to help!
Domain: x is greater than or equal to 2 but is less than our equal to 7
range: y is greater than or equal to 6 but is less than or equal to 18