Answer:
Do you have a friend that can affect your mood? Whenever she's up, you're up. When she's down, you're down. A proportional relationship between quantities is a lot like that. For example, imagine a beehive that has a lot of bees in it. Each of those bees has six legs. If I take away half the bees, there will only be half as many legs left in the hive as well. There is a proportional relationship between the number of bees and the number of bee legs in that hive.
A proportional relationship exists between two values x and y when they can be expressed in the general form y = kx, where k is the constant of proportionality.
Our beehive example could be represented by y = 6x, where x is the number of bees, y is the number of legs, and k is 6 (since each bee has 6 legs). If I double x, then y will also double, and if I divide y by x, then y/x should always be 6.
Another way to say that is if two values are proportional, then dividing them by each other will always produce the same ratio. This ratio will be the constant k, which can be expressed as a fraction or a decimal.
Explanation:
I hope this helps :)!
OK so basically in the middle ages Spain was ruled by the Muslim moors <span />
Answer: Natural vegetation refers to a plant community, which has grown naturally without human aid and has been left undisturbed by humans for a long time.
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Transportation has changed quite a bit since the "olden days." Nowadays, going from one part of the world to another in mere hours is not a fantasy any longer, the way it used to be hundreds of years ago.
Airports have started catering to international flights more in the 1930s than a decade before when they focused more on regional and municipal travels. This enabled people to travel the world for pleasure or work. With the development of airports and international travel, tourism also flourished - hotels, restaurants, etc. began sprouting up everywhere to attract tourists and travelers.
The automobile industry grew rapidly as well - one example would be Henry Ford's Model T because it was affordable, and therefore mass-produced so many people could have it.
The US started focusing on building more freeways as that is the most popular way to transport goods within the country. In the past, roads were used but with the 'invention' of more practical ways of transportation, this process was sped up.
In other parts of the world, like the UK, the first subway systems appeared, namely, London Underground in 1863. This saved the city from automobile congestions and transferred part of its travel underground.
And there are many other great inventions and improvements to come in the future.
