Sound waves are not able to travel in a vacuum, sound requires a medium such as air or a solid for example. Satellites are indeed in space, but radio waves are not sound waves they are a form of light. Light can travel in a vacuum so the messages that satellites beam back to Earth are light waves not sound waves, that is why it is possible.
<span>D. price ceiling
</span><span>This is a government regulation that establishes a maximum price for a particular good.</span><span>
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Coals energy is affordable and it is easy to burn.
