In mesopotamia, the ownership of property and the specialization of trades and crafts made visual identification necessary. images on became trademarks for the owner.

Cylinder seals

Explanation:

The human species originated in Africa around 300,000 years ago, but the first civilization that modern archaeologists have discovered was located in Sumer, Mesopotamia, around 10,000 BC.

Mesopotamians invented agriculture, writing, art, culture and trade. One of the ways to control goods produced and traded was to trademark them with cylinder seals specially to mark items on clay. They used clay a lot, for writing, pottery and construction.  

Cylinder seals

Explanation:

Cylinder seals was used in Mesopotamia to authenticate documents from forged ones. Cylinder seals are formed when writings and images are cut on the surfaces, when rolled across a damp clay tablet, the final result of the design becomes the trademark for the owner.

x=3

step-by-step explanation:

this is really simple i saw that there was only one term (5x) and thought if that was 15 what would i have to multiply everything else to get it there? well if 5x became 15 then x would have to be 3 so plug the 3 in the x for the other equations and you get 15 for the other ones. so there you go. : )

answer; dividing net income by 1- t ;