A water line is to be laid from a well to an island 5 km cast of a straight north/south shore line as shown in the diagram. The portion of the pipeline that is in the water costs $5000 per km to construct while the portion on land costs $3000 per km. Write a function to represent the total cost C of the pipeline as a function of d the distance south of the island where the pipeline comes ashore. What is the domain of the function? 5 km sland 10 km well

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