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calculus

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A power station and a factory are on opposite sides of a river 50 feet wide. A power line must be run from the station to the factory. It costs 25 dollars per foot to run the cable in the river and $15 per foot on land. Express the total cost as a function of x, where x represents the distance downstream from the power station to the point where the cable touches land.

  • calculus - ,

    assume the line goes on the same side L, the n crosses.

    cost=15L+25sqrt(50^2+(L-x)^2 )
    Where L is the distance downstream to the factory.
    So what is dcost/dx ?

    check my thinking.

  • calculus - ,

    i have a similar question but instead of 50 its 60 aqnd 15 is 20

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