Answer:
6
Explanation
Any numbers in scientific notation are considered significant. For example, 4.300 x 10-4 has 4 significant figures.
Answer From Gauth Math
Answer:
Explanation:
Given
Distance between source and receiver 
Sound Intensity 
Distance of of second observer 
Intensity varies as

using this





because blah blah blah blah
The speed of electromagnetic waves in a vacuum is the same as the speed of light. It can be measured by finding the frequency and wavelength of two different waves, and then by that correlation, the speed of the waveform.
Hope this helps you (:
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