if this is a homework question, they probably mean the pedestrian 20 outfit answer.
Do 13 x 13 x 13.
13 x 13 x 13 = 2197 in3
Hope this helps!
For the angle MPN we know that is oposite to the angle QPL so the will be equal so:

Now with the value of MPN we can made an equation for x so:

and we solve for x

and the angle LPM will be the complementari angle of 125 so:
4 terms.
6x2, 2x, 14y, and 3x