What number should be added to both sides of the equation in order to complete the square?
1. x2 + 20x = 10
2. x2 - 4x = 8
3. x2 + 5x = 3
4. x2 - 9x = 5
5. 2x2 - 48x = 10

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.