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:
Completing the square
Step-by-step explanation:
The next step would be to factor into a perfect square
The sum if the geometric sequence given by:
an=-2(3)^(n-1)
will be:
when:
n=1
an=-2
when n=2
a2=-6
when n=3
a3=-18
when n=4
a4=-54
when n=5
a5=-162
when n=6
a6=-486
when n=7
a7=-1458
when n=8
a8=-4374
thus the summation of the term will be:
Sn=(-4374+-1458+-486+-162+-54+-18+-6+-2)
Sn=-6560
the answer is -6560
I think is 3 and 2/3 (I hope I got it right)
