The illumination I, in foot-candles, produced by a light source is related to the distance d, in

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The illumination I, in foot-candles, produced by a light source is related to the distance d, in feet, from the light source by the equation


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where k is a constant. If k = 640, how far from the light source will the illumination be 2 foot-candles? Give the exact value, and then round to the nearest tenth of a foot.

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Related Book For  answer-question

Intermediate Algebra

ISBN: 9780134895987

13th Edition

Authors: Margaret Lial, John Hornsby, Terry McGinnis

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