Which of the following was not an advancement or invention of the civilizations of mesopotamia?

a: wheel

b: iron

c: bronze

d: sail

B: iron

Explanation:

Mesopotamia was the place where numerous things were invented and where the civilization had its first advances, setting up the ground for the development of the region and the other civilizations. The people of Mesopotamia were one of the first to learn how to use the bronze. They invented the sailboat, as well as the wheel. In Mesopotamia we have the first writing system, the invention of time, mathematics etc. One thing that the Mesopotamian people did not invented and it was not their advancement was the iron-work. They did used it later in history, but the iron-work was mastered by the Hittites from Anatolia, and they were the ones that introduced it to the Mesopotamian people.

B: iron

Explanation:

Mesopotamia was the place where numerous things were invented and where the civilization had its first advances, setting up the ground for the development of the region and the other civilizations. The people of Mesopotamia were one of the first to learn how to use the bronze. They invented the sailboat, as well as the wheel. In Mesopotamia we have the first writing system, the invention of time, mathematics etc. One thing that the Mesopotamian people did not invented and it was not their advancement was the iron-work. They did used it later in history, but the iron-work was mastered by the Hittites from Anatolia, and they were the ones that introduced it to the Mesopotamian people.

the perimeter of a triangle is 69 cm. side a is 5 cm shorter than side b. side c is twice as long as side a. find the length of each side. i need to know how to do it in 2 equations.  

equations:

a = b-5

c = 2a

a + b + c = 69