paul can rent equipment for $35 per day, or he can rent it at a cost of $20 plus $4 per hour of use. Use an inequality to find the number of hours of use (to the nearest hour at which it is more economical to pay the single fee for the day.

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.