Carla bought 66 inches of pink ribbon and 36 inches of white ribbon. She wanted to cut each ribbon into 6 equal pieces.

Which explanation correctly shows how to calculate the difference in length between one piece of pink ribbon and one piece of white ribbon?

The question is a little confusing. I would probably say multiplication? You need to divide both by 6, because she wants 6 pieces to fit into both values. So 66/6=11 and 36/6=6. Then I suppose a subtraction to find the difference, which would be 11-6=5, so 5 inches difference between one piece of pink and one piece of white. Hope I got this right and that was actually what the question was asking haha. Sorry if not

No a triangle cannot be formed because when you add the two smallest number together (which would be 11) the have to be bigger than the number it is "against" ( which would be 12)