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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? 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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