A library has three branches located throughout a city at points D(1, 3),
E(1, 1), and F(5, 1). The main library is
equidistant from the three branches. Find
the location of the main library.

please solve quick i need help !

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.