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mat117_appendix_d

# mat117_appendix_d - Appendix D The Environment...

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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? C=6000/200 - 2x) replace x with the percent C = 6000/(200 – 2•75) = 6000 /(200 - 150) =6000/50 = 120 million dollars b. What is the cost to remove 90 % of the pollutant? C=6000/200 - 2x) replace x with the percent C = 6000/ (200 – 2•90) = 6000/ (200 - 180) =6000/20 = 300 million dollars c. What is the cost to remove 99% of the pollutant? C=6000/200 - 2x) replace x with the percent C = 6000/ (200 – 2•99) = 6000/ (200 - 198) =6000/2 = 3000 million dollars d.

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