Solve the problem.The phone company needs to install a line from point A on shore to an island that is 7 miles away from point B, as shown in the drawing below. The cost associated with installing underwater cable is $18,600 per mile, while the cost associated with installing cable over land is $9000 per mile. For the project to be completed at minimum cost, how much of the cable should be installed over land? In other words, at what distance from point A should the company stop laying cable over land? Round your answer to the nearest tenth of a mile, if necessary.7 miles
? 10 miles
A. 5.7 miles
B. 6.1 miles
C. 6.9 miles
D. 8.1 miles
Answer: B
Mathematics
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÷ 
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