F(-4) for f (x) = -4x+9f(-4)=?
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Let 
be the point on the ground to with the 18 foot guy is anchored and 
the point on the ground to with the 21 foot guy is anchored.
We can conclude that the <span>the two wires at the points where they are anchored are 21 feet apart. Check the procedures in the picture attached.</span>
We can conclude that the <span>the two wires at the points where they are anchored are 21 feet apart. Check the procedures in the picture attached.</span>