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December 19, 2014

December 19, 2014

Posted by **Alexis** on Wednesday, November 20, 2013 at 2:30am.

How many feet from tower 1 should point A be so that the total length of guy wire is minimal? Do not include units in your answer.

Distance from tower 1 to point A is???

- Math (Calculus) -
**Steve**, Wednesday, November 20, 2013 at 6:30amwithout a diagram, I assume point A is an anchor in between the towers. If its distance from T1 is x, then the cable length is

d = √(60^2+x^2) + √(20^2+(140-x)^2)

to find the minimum, we want dd/dx = 0

That happens when x=105

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