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Precalculus 8 Online
OpenStudy (anonymous):

Please help with Distance problem! http://www.math.washington.edu/~m120/TheBook/TB2010-11.pdf That's the link to my text book, the problem is on 2.5 excercises and is question 2.4! The one with the ferry! Please help me, I'm desperate for this one since I don't understand it!

Directrix (directrix):

Here is the problem:

Directrix (directrix):

Here are the questions:

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