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School: East Spring Secondary
Class: 2E3! ♥
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Chairperson: Safwan
Vice-Chairperson: Eileen Koh
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Monday, March 22, 2010

Mathematics
Investigative work
S1E3 Group 7
Group Members
Mei Ting
Amabel
Hariz
Jasmine


Part A-
The population is 16 758 114 people and the area is 756 950km square.

To find the number of people per square km is using 16 758 114 (The population of the people) divided by 756 950km square(The area).
The answer is 22.13899...
but it is needed to correct to 4 sig fig.
So, the final answer is 22.14(4 sig fig).


Part B-
Estimate the total population of Chile to the nearest million.
The total population is 16 758 114 as stated in (A).
When estimated to the nearest million, the answer is
16 758 114 estimated 17 000 000
=========

300 people were killed because of the earthquake.
And there are left with 16 758 114 minus 300 is equals to 16 757 814
(people).

And calculate the people killed as a percentage of the
ESTIMATED total population of the people,
300 over 17 000 000 multiply by 100 percent is equals to 0.001764705 percent

Part C-



The depth of earthquake is approximately 35km from land surface.
Write down the 2 possible original values correct to 4 sig fig.

The answer could be lesser than 35km or more than 35km.

34.995 could be the one of the original value,so corrected to
4 significant figure, the answer is 34.99 and when corrected to ones
the answer is 35km. ====

35.363 could also be the original value,so corrected to
4 significant figure, the answer is 35.36 and when corrected to ones
the answer is 35km. ====



Part D-

y=c(a+2.03) multiply by 1000000

y is equals to the water needed by the country per day(in litres)
=
c is equals to the population per square kilometer
=
While a is equals to the reserve needed per person,which is 1.07 litres
=
Find y
=
So,1.07 plus 2.03 equals 3.10.
Then,c(3.10) is equals to c multiply by 3.10.

c is equals to the population per square kilometer,
so we got the answer from (a)
c=22.14
So we take 22.14 multiply by 3.10 = 68634
Next, take 68634 multiply by 1000000 and you will get the answer 68634000

Part E-

From the previous answer it is 68634000
It is said that Chile needs twice of its daily usage of water.
So,68634000 multiply by two and the amount of water reserve
needed by Chile is
137268000


Part F-
Chile is the leading supplier for copper metal.

After the earthquake, the price of copper will definitely increase.
It is caused by the earthquake. After the earthquake Chile needs
resources like food, water, clothes and shelter for the wounded
and the victims of the quake, but it is all destroyed by the quake.
And in order to get all these resources, they need money to buy
from other countries, perhaps. So they have to increase the prices
of copper metal and get more money to buy the resources.




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