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Week 4-mat117 Checkpoint

# Week 4-mat117 Checkpoint - 10/27 80/11-20-17/7 4/5 5-3 3 2...

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10/27 80/11

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-20 -17/7
4/5 5

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-3, 3 2
Pass = 60 Freight = 50 Going = 30

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First = 23 1/5 Second = 59 90
Y = 10x 457786000

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488/3 K = 72 Y = 72/x
Inverse Solution: 14/5 or 2.8 or 2 4/5 (depending on the format they want it) 2450/9

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1.The cost, in millions of dollars, to remove x % of pollution in a lake modeled by C=6000/200-2x  a.What is the cost to remove 75% of the pollutant?  Plug in x = 75: 6000/(200-2*75) = 6000/(200-150) = 6000/50 = 120 million dollars b.What is the cost to remove 90 % of the pollutant?  Plug in x = 90: 6000/(200-2*90) = 6000/(200-180) = 6000/20 = 300 million dollars c.What is the cost to remove 99% of the pollutant?  Plug in x = 99: 6000/(200-2*99) = 6000/(200-198) = 6000/2 = 3000 million dollars d.For what value is this equation undefined?  The equation is undefined when x = 100, and that's because the bottom of the fraction = 0, at x = 100: 200 - 2x = 0 x = 100 e.Do the answers to sections a-d match your expectations? Why or why not?
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Week 4-mat117 Checkpoint - 10/27 80/11-20-17/7 4/5 5-3 3 2...

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