(4/25)^1/2 and (4/25)^-1/2

For which rational expression is -2 an excluded value of x?

Which is equivalent to 10/12? options: 10/18 5/6 3/12 9/11

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.