Answer:
how many bags are there?
Step-by-step explanation:
D is correct because y on I doesn't equal y on II.
The median or middle would be 1.5, since in the middle are 2 numbers 1, and 2. You would add them together and divide them by 2 and get 1.5
I'm assuming that you mean

because if you meant

then u would simplify and you couldn't make it the subject.
Under this assumption, we start with

We multiply both sides by 

We expand the left hand side:

We move all terms involving u to the left and all terms not involving u to the right:

We factor u on the left hand side:

We divide both sides by 
