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# Answer Key to Appendix+D+Solutions[1] - MAT 117 Algebra 1B...

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MAT 117 Algebra 1B Answer Key for Rational Expressions and Equations—Part 1, Due in Week Four Answers to Appendix D are provided in red. Environmental and wildlife preservation ensures future generations will have resources available 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. 1. The cost, in millions of dollars, to remove x % of pollution in a lake modeled by x C 2 200 6000 - = a. What is the cost to remove 75% of the pollutant? 120 50 6000 150 200 6000 75 2 200 6000 = = - = × - = C It will cost \$120 million to remove 75% of the pollutant. b. What is the cost to remove 90 % of the pollutant? 300 20 6000 180 200 6000 90 2 200 6000 = = - = × - = C It will cost \$300 million to remove 90% of the pollutant. c. What is the cost to remove 99% of the pollutant? 3000 2 6000 198 200 6000 99 2 200 6000 = = - = × - = C It will cost \$3,000 million or \$3 billion dollars to remove 99% of the pollutant. d.

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Answer Key to Appendix+D+Solutions[1] - MAT 117 Algebra 1B...

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