Yes it is, the two lines intersect that point.
You didn’t show any distances
Use this chart, every way it can add up to ten: i.e. 5,5 6,4...
Try sketching the cardboard piece labeling each side. when folded, the height of the box is x, the length is now (13 - 2x), the width is now (6 - 2x) after cutting out the squares from each corner.
volume = length*width*height
V(x) = x(13 - 2x)(6 - 2x)
There are 3 answers which are 4 8 and 2
