Appendix D
The Environment
Environmental and wildlife preservation ensures future generations will have available resources and can
enjoy the beauty of Earth. On the other hand, some of the damage humans have already done to the
environment is expensive and time consuming to eradicate.
Application Practice
Answer the following questions. Use Equation Editor to write mathematical expressions and equations.
First, save this file to your hard drive by selecting
Save As
from the
File
menu. Click the white space
below each question to maintain proper formatting.
1.
The cost, in millions of dollars, to remove x % of pollution in a lake modeled by
x
C
2
200
000
,
6

=
a.
What is the cost to remove 75% of the pollutant?
Given that x = 75%
Therefore,
120
50
6000
150
200
6000
75
2
200
6000
=
=

=
×

=
C
Cost to remove 75% of the pollutant will be 120 million dollars.
b.
What is the cost to remove 90 % of the pollutant?
Given that x = 90%
Therefore,
300
20
6000
180
200
6000
90
2
200
6000
=
=

=
×

=
C
Cost to remove 90% of the pollutant will be 300 million dollars.
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 Spring '09
 GEORGEGREAVES
 Average cost, Whitetailed deer

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