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The intensity I of light from a light bulb varies inversely as the square of the distance d from the light bulb. Suppose I is

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The intensity I of light from a light bulb varies inversely as the square of the distance d from the light bulb. Suppose I is 810 w/m- when the distance is 7 m. How much farther would it be to a point where the intensity is 160 w/m-? It would be meters farther. (Simplify your answer.)

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