Question 366807
1. The cost, in millions of dollars, to remove x % of pollution in a lake modeled by C=5,000/300-3x
a. What is the cost to remove 60% of the pollutant?
C=_5,000
300-3x
C=5,000
300-3(60)
C=5,000
300-180
C=5,000
120
C=$42 million
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OK
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b. What is the cost to remove 80 % of the pollutant?
C=5,000
300-3x
C=5,000
300-3(80)
C=5,000
300-240
C=5,000
60
C=$83 million
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OK
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c. What is the cost to remove 95% of the pollutant?
C=5,000
300-3x
C=5,000
300-3(95)
C=5,000
300-285
C=5,000
15
C=$333 million
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OK
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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.
300-3x
300-3x-3x-3x
x=100
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OK
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Cheers,
Stan H.
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