That would make a rectangular prism with measurements of:
Length = 9
Width = 4
Height = 10
V = lwh
V = 9 * 4 * 10
V = 360
Hey i think the only mistake i caught was when you put 3 points under the line mark instead of only needing 2.
Possibly another mistake at 3a, Only 2 points (but i could be wrong)
Hey I tried, hope it helps... can't work it out, all the best