What would be the lowest value that X minus Y could take on? Well, the lowest value is if you have a low X and you have a high Y, so it'd be 15 minus five. So this would be 10 right over here. That would be the lowest value that you could take on. And what would be the highest value? Well, the highest value is if you have a high X and a low Y, so 17 minus three is 14. So notice, just as we saw in this case of the sum, even in the difference, your variability seems to have increased.