<span>The old faithful geyser found in Yellowstone park is an example of a hot spring.
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The correct answers are:
- barter;
- gold;
The barter and the gold were the most common things used in the Ancient world for trade. The barter, or bartering, is essentially the exchange of goods, or rather one good for another good. That of course goes in accordance to the valuation of the goods, so for example, one goat would be traded for ten rabbits. The gold, on the other hand, was a materialistic thing used for exchange of goods. The gold was very highly valued, so each amount of gold had certain valuation, and according to its valuation the people were able to purchase certain goods with it. The gold was in a many ways what the paper money are in the present day.
the introduction of the variable z means that the graphed functions now represent planes, rather than lines. the substitution method involves solving for one of the variables in one of the equations, and plugging that into the rest of the equations to reduce the system.
<span>Factors contributing to the west ward expansion of the United States include the discovery of gold, the Homestead Act, and the desire for adventure, land and riches. The answers are the third, fourth and fifth statements among the choices that you have included or posted.</span>
