A painter charges according to two different plans, A and B. Under Plan A, she charges $500 plus $45 per hour. Under Plan B, she chargee $55 per hour. After how many hours will Plan b be more profitable than plan a for the painter

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.