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December 20, 2014

December 20, 2014

Posted by **lee** on Thursday, January 24, 2013 at 7:58pm.

can someone please explain?

- algabre -
**Misha**, Wednesday, March 20, 2013 at 6:29pm(22.5/r-6)+(22.5/r+6)=9

Multiply the equation by r^2-36.

Resulting equation: 9r^2-45r-324=0

Simplify: r^2-5r-36=0

Factor: (r-9)(r+4)

Answer: rate of ferry= 9mph

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