The variables and yare directly proportional, and y = 4 when I = 3. What is the value of y when x = 15? A.4/3

B. 12

C. 16

D. 20

E. I don't know

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