Given the area of the shaded region is 12pi, find the measure of angle AOC in DEGREES (not radians)

The triangles in the diagram are congruent. if mzf = 40°, mza = 80°, and mzg = 60°, what is mzb?

The suare root of 9x plus 7 plus the square rot of 2x equall to 7

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