Which set of ordered pairs corresponds to a direct variation?
{(-2,2),(-1,3),(1,5)}
{(-3,2),(4,3),(6,6)}
{(-1,3),(0,0),(1,5)}
{(-4,4),(-1,1),(3,-3)}

Adecibel is a logarithmic unit that can be used to measure the intensity of a sound. the function y = 10logx gives the intensity of a sound in decibels, where x is the ratio of the intensity of the sound to a reference intensity. the reference intensity is generally set at the threshold of hearing. use the graphing utility to graph the decibel function. a whisper has a sound intensity of 30 decibels. use your graph to you complete the following statement. the sound intensity of a whisper is times the reference intensity.