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Randy wants to attach a `21` foot string of lights to the top of the `18` foot mast of his sailboat. How far from the base of the mast should he attach the end of the light string? Round your answer to two decimal places.

A picture of a boat is shown. The height of the center pole is labeled. The string of lights is at a diagonal from the top of the pole and is labeled.

`x` = feet
 

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< > ≤ ≥ or All Real Numbers DNE
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