You are laying phone cable between two cities and must cross a lake. You will lay L miles on land. The cost C, in dollars, depends on how much cable is on land and how much is in water. The relationship is
.
?
How much cable do you lay on land to achieve a minimum cost, and what is that minimum cost? Round your answers to two decimal places.
?
A. The minimum cost of $7.25 is achieved if you lay 2543.73 miles of cable on land.
B. The minimum cost of $2543.73 is achieved if you lay 7.25 miles of cable on land.
C. The minimum cost of $5.32 is achieved if you lay 2541.63 miles of cable on land.
D. The minimum cost of $2541.63 is achieved if you lay 5.32 miles of cable on land.
Answer: D
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