Okay so this is a order of operations typa thing.
So if we just do that problem
19+7/2-5= 19+3.5-5=22.5-5=17.5
But since it wants to equal 8 put parenthesis in a place to where it equals 8. I would just randomly start putting the parenthesis.
A) (19+7)/2-5= 26/2-5= 13-5=8
Wow lucky first try
But just for funzies
B) 19+7/(2-5)= 19+7/(-3)=19-2.333=17.333
There are only two options so the first is where you put the parenthesis.