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select 2 choices. which of the following equations represents non-linear functions?

a. y=5-2/3x

b. y=5x^2 +7

c. y=1.5x-0.25

d. y=3

e. y=10/x+20

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.