4 x 1 ) 3 18 July 8, 2019 16 32 64 128 4 x 1 )+ 3 18 4 x 3 )+ 18 6 x 1 )- 2x 1 9 x 4 9 x 3 1 18 X 1 x 3 x 4 180 5 16 18 x 1 3 4 18 x 1 5 3 4 4 4 17 х 3 1 18 4 1 3 x 18 divided by 2 1 3 4 x 18 lvl 4 9 x 36 )=- 1 3 2x 18 1 3 4 x 18 lvl weight per foot 1 4 x 3 2 18 18 x 1 4 3 6 8 3 x )+ 2 4 x 1 )- 18 18 3 4 x 8 1 3