Which best helped the Romans create a variety of architectural structures? A.
use of concrete

B.
use of villas

C.
use of Greek orders

the use of Greek orders helped the romans create a variety of architectural structures. so, the answer is c.

The use of concrete

Explanation:

I entered the use of Greek orders and it was wrong. Plus B doesn't make sense.

perimeter = 2l +2w, divide total perimeter by 2 for total length of 1 side and 1 width

172/2 = 86 (  total for 1 side and 1 width)

86-24 = 62 (since length is 24 ft longer subtract 24 then divide by 2 for width)

62/2 = 31

width = 31 feet

length = 31 +24 = 55 feet

check: 31*2 = 62, 55*2 = 110,  110+62 = 172