Question 200987
 The loudness L of a sound (measured in decibels, dB) is inversely proportional to the square of the distance D from the source of the sound level of 70 db; how loud is the lawn mower when the person is 100ft. away?
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L(D) = k/D^2
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Comment: Some data is missing from your post.
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Cheers,
Stan H.