The illumination I, in foot-candles, produced by a light source is related to the distance d, in
Question:
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
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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d= k
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Related Book For
Intermediate Algebra
ISBN: 9780134895987
13th Edition
Authors: Margaret Lial, John Hornsby, Terry McGinnis
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