# Wildlife Preservation

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 when writing mathematical expressions or 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. You must show your work and/or justify your answer on ALL problems (even if it isn’t requested or the problem seems simple).

1. The cost, in millions of dollars, to remove x % of pollution in a lake modeled by C = 10000/(400 – 4x)

HINT: The value entered for x should not be converted to a decimal. Enter the percent as a whole number (i.e. 50% would be entered as 50 not 0.50).

a. What is the cost to remove 75% of the pollutant? Remember to include the units. (2 pts)

b. What is the cost to remove 90% of the pollutant? Remember to include the units. (2 pts)

c. What is the cost to remove 99% of the pollutant? Remember to include the units. (2 pts)

d. For what value of x is this equation undefined? (3 pts)

e. Do the answers to sections a. through d. match your expectations? Explain why or why not. (1 pt)

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