Answer:
Step-by-step explanation:
Pollution can be defined as the introduction of harmful substances (man-made or natural) into the environment.
There are four major types of pollution:
1. Land pollution
2. Water pollution
3. Air pollution
4. Noise pollution
Land pollution refers to the gradual disintegration of the earth surface.
Causes of land pollution
1. Deforestation: The continuous cutting down of trees in the forest.
2. Erosion: The gradual disintegration of soil caused by the action of water.
3. Harmful agricultural practices such as bush burning, introducing toxic substances such as pesticides into the soil
4. Increased industrial waste due to increase in the number of industries
5. Mining of natural resources from the earth surface
6. Construction of bridges, railways and roads
Answer:
![y=2^{1-x}](https://tex.z-dn.net/?f=y%3D2%5E%7B1-x%7D)
Step-by-step explanation:
<u>Exponential Function</u>
When we need to express the exponential relation between two variables, we use the equation
![y=Cr^{x}](https://tex.z-dn.net/?f=y%3DCr%5E%7Bx%7D)
where C, r are constants to be determined by using the given points from the table
For x=0, y=2, thus
![2=C.r^{0}=C](https://tex.z-dn.net/?f=2%3DC.r%5E%7B0%7D%3DC)
We find that C=2
The equation is now
![y=2r^{x}](https://tex.z-dn.net/?f=y%3D2r%5E%7Bx%7D)
Now we use the point x=1, y=1
![1=2r](https://tex.z-dn.net/?f=1%3D2r)
We find that
![\displaystyle r=\frac{1}{2}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20r%3D%5Cfrac%7B1%7D%7B2%7D)
Thus, the equation is
![\displaystyle y=2\left(\frac{1}{2}\right)^{x}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20y%3D2%5Cleft%28%5Cfrac%7B1%7D%7B2%7D%5Cright%29%5E%7Bx%7D)
Rearranging
![y=2(2)^{-x}=2^{1-x}](https://tex.z-dn.net/?f=y%3D2%282%29%5E%7B-x%7D%3D2%5E%7B1-x%7D)
The required equation is
![y=2^{1-x}](https://tex.z-dn.net/?f=y%3D2%5E%7B1-x%7D)
We can easily verify the last two points are also obtained by using the equation
Y would equal 14 because for the first example 10 is multiplied by 2. If we also multiply 7 by we get 14.
730 or 725!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!