



 
Hi Gilligan. If the distance the cable is laid along the road is x and the distance in the roadwise direction between the connexion box and the house is 5 miles, then the roadwise length of offroad cabling is 5  x. So you have a right triangle for the offroad portion where the cable is laid along the hypotenuse and the lengths of the two legs of the right triangle are 2 and 5  x. Use Pythagorus to find the length of the hypotenuse in terms of x. Multiply by 14. That's the offroad cost. Add that to 10x for the onroad cost. That's your function. Hope this helps,  


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