From the list of 9 weights we see that
Puppies in range 10-11 = 3
range 12-13 = 4
range 14-15 = 2
The second histogram described is the correct one.
Any irrational number produces an irrational number when added to 3/4.
This is because 3/4 is rational (it can be represented as a ratio of two integers). You can get an irrational number only when you add rational to irrational (because rational to rational produces a rational sum).
So when you're solving for x here and distribute 8 on the right side, it would look like this:

Now in order to solve for x, we know we have to get all the x's on one side of the equal sign. Let's get all our x's to the left side. Since the right side has a positive 8x, you need to subtract 8x on the right. But whatever you do to one side you must do to the other. So since we are subtracting 8x on the right, we need to do that on the left.
But we can't! Since both sides will cancel out to zero before x can be solved.
Therefore the answer is 0.
Hope that helps!
Is 10 and 15 because they both have a value of .909