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We could answer all the questions, but you wouldn't learn how to answer them.

Take a good look at my answer to your previous question: http://answers.yahoo.com/question/index;_ylt=Apy14...

Then you might want to read this: http://www.mathsisfun.com/polar-cartesian-coordina... .

Then follow up with questions about what you don't understand.

Feel free to email me if you need more help about how to go about solving the problems.