Given the following graph for f(x) and the equation g(x)=2x^2-8x+1 what is the value when the Y value of the vertex of f(x) is subtracted from the y value Of the vertex of g(x)

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