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How to solve direct and indirect/inverse variation problem?

Asked by scotielee (117points) October 5th, 2009

I am having trouble with the following problem in my math course. Can anyone help with explaining this?

The electrical resistance of a wire varies directly as its length and inversely as the SQUARE of its diameter. If a wire with a length of 100 cm and a diameter of 2 mm has a resistance of 1.5 Ohms, find the resistance of a wire with a length of 300 cm and a diameter of 3 mm.

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