Region a
Region b
Region c
Region d​

you can first factor out the n to get n(1+5). we know that 1+5 is 6, so we just have 6n.

6mm^3 or .6cm^3

      216

      /   \

  36     6

  /   \     /

6     6   6

factor trees are nice.

to find the perimeter, you add up all the lengths of the sides. in this case you would have to add up 18+22+40+80 which equals 160.