The mapping diagram shows a function. What could be a possible value for the
missing number n?
A7
C9
B8
D 15

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.

Divide. –40 ÷ –5 a –8 b 200 c -200 d 8

Which of the following will form the composite function?