There is a cube with the length 1.5 width 10.5 and height 4 i know the answer but i dont know how to solve it for my class

Question

I have assign a page for my class but, I want to show them but a problem is to hard.

Answer 1

you have a rectangular solid but it's not a cube because the length, width, and height of a cube are all equal

SA=2wh+2lh+2lw  where l=length, w=width, and h=height

the opposite rectangles in a rectangular solid are congruent (the left and right, the top and bottom, and the front and back)

SA=2*10.5*4+2*1.5*4+2*1.5*10.5

SA=84+12+31.5

SA=127.5 square units