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The cost, in millions of dollars, to remove x % of pollution in a lake modeled by
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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)
2. Biologists want to set up a station to test alligators in the lake for West Nile Virus. Suppose that the costs for such a station are $3,500 for setup costs and $4.00 to administer each test.
a. Write an expression that gives the total cost to test x animals. Explain.(3 pts)
b. You can find the average cost per animal by dividing total costs by number of animals. Write the expression that gives the average cost per animal. Explain. (3 pts)
c. Find the average cost per animal for 10 animals, 100 animals, and 1,000 animals. (3 pts)
d. As the number of animals tested increases, what happens to the average cost to test the animals? How do you know this? (2 pts).
e. Would the average cost ever fall below $4.00? If so, identify a value that supports your answer. If not, explain how you know. (4 pts)
f. How many animals should be tested for the average cost to be $5.00 per animal? Make sure to show how you derived the answer. (4 pts)
3. To estimate animal populations, biologists count the total number of animals in a small section of a habitat. The total population of animals, P, is directly proportional to the size of the habitat, A, (in acres) polled.
a. Write an equation with P and A that could be used to solve for the constant of variation k. Explain. (Hint: No numbers are included) (3 pts)
b. A biologist counted 30 white tail deer in a 200-acre parcel of land in a nature preserve. Find the constant of variation
k. (4 pts)
c. If the entire nature preserve is 3000 acres, then what is the total white tail deer population in the preserve? Describe how you arrived at your answer. (4 pts)

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