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How far could you drive on 50 gallons of gas

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2

The graph shows the decibel measure for sounds depending on how many times as intense they are as the threshold of sound. noise in a quiet room is 500 times as intense as the threshold of sound. what is the decibel measurement for the quiet room? 20 decibels28 decibels200 decibels280 decibels