The focus of a parabola is (0, -3) and the directrix is y= 3. What is the equation of the parabola? O y=1/12x^2
O y=-1/12x^2
O x=1/12y^2
O x=-1/12y^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