Wrac's In Before we begin, let's go back to the time when you first encounter how to evaluate
expressions
Do you still remember?
Given the following expressions, find its value if x = 3.
1. X-9
2. 3r7
3. * +42-10
4. 2r -6x + 26
5. 3r-6

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.