Originally Posted by

**magentarita** A power company needs to string a power line between 2 buildings. One building is located on the west side of a river, and the other building is located 3000 ft downriver on the opposite side of the river. The river is 500 ft wide. The power line must run underground on the shore and underwater across the river. The cost to run the line underwater $50 per foot, and the cost to run the line underground is $40 per foot.

A) How much does it cost to run 500 feet of wire underground and rest underwater?

B) How much does it cost to run 1000 feet of wire underground and rest underwater?

C) Write an equation/ function for the total cost to run the power line between the 2 buildings in terms of the amount of wire run underground.