1.Write an addition expression using decimals that equals -0.5

2. Solve the following expressions.(Show your steps for subtraction
A. - 3.1+(-0.35)
B. - 7.34-(-5.51)
C.20.25+(-5.51)

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.