The roman empire created the world’s firsta) irrigation system b) network of roadsc) system of writingd) firefighting biragades.

The correct answer is D) firefighting brigades. It was under the reign of Roman Emperor Augustus that the first fire brigade was organized. It was known as the vigils and its members were ex-slaves who had been trained in firefighting. They were very much appreciated and admired by common Romans. Eventually, firefighting brigades would be created in most cities of the Roman Empire.

the correct answer is “opportunity cost”. opportunity cost is what a company misses out because it decided in one option over another one. in this case, the company decided to invest in building a factory so it gave up another possible benefit or profit in order to achieve success with the factory.  

trade-off is not the correct answer since it is a situation in which you accept losing something in return for benefits in other areas.

and finally, consequence is a general term used to accept what it comes when you make a decision. it can be a positive or negative consequence depending if the decision you took was the correct one.  

increases in demand are shown by a shift to the right in the demand curve. this could be caused by a number of factors, including a rise in income, a rise in the price of a substitute or a fall in the price of a complement.

which the answer is:

b