A repair person calculates his service fee by using the equation F = 40t + 5, where F is the service fee in dollars and t is the number of hours spent on the job. a. how long did a particular job take if the service fee was $155? b. explain what the numbers 40 and 55 could represent as costs in the service fee equation.

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.