Help meee please ONLY IF YOU KNOW WHAT UR DOING I WILL GIVE BRAINLEST

If the scale factor between two circles is 2x/5y what is the ratio of their areas?

Which expression is equivalent to (4 +6i)^2? ? -20 + 48i 8 + 12i 16 - 36i 20 + 48i

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