M(-2, 8) is the midpoint of AB with A(6, 4). What are the coordinates of point B? (-4,2)

(-10, 12)

(14,0)

(12,6)

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