I don't why you put -+ but I will go ahead and assume that it is -2.
4-+6
I think it is saying 4 - positive 6 but I'm guessing.
There is no equation, nor ordered pair, so it is impossible to answer this question. I apologise.
Answer:
16
Step-by-step explanation:
Let's take a look.
So we have 3*2*2*2*2=48 glasses
if half used 2 and other half used 1... we have a sum of 2+1=3
so 48/3 = 16