Open circle means greater than or less than. Closed circle signifies great than or equal to or less than or equal to.
Knowing this we now know it can't be the first or last one.
You can simplify it by adding 7 on both sides so 3x < 18 then simplify again by dividing 3 on both sides making it x<18.
Therefore, its the second option from the top.
Hope this helped!!!! :))))))) and tell me if i got it right :)
