P89 (45)
In certain situations, it is necessary to weigh the benefit of pursuing a certain goal against the cost of achieving that goal. For instance, suppose that to remove x% of the pollution from an oil spill, it costs C thousands of dollars,where C(x) = 12x / 100-x
c. What happens as x→100-? Is it possible to remove all pollution?
左極限有等於右極限?
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