Write the first five terms of each sequence. Determine whether each sequence is arithmetic, geometric, or neither.
•a(1)=7,a(n)=a(n-1)-3 for n>2

•b(1)=2,b(n)=2•b(n-1)-1 for n>2

•c(1)=3,c(n)=10•c(n-1)for n>2

•d(1)=1,d(n)=n•d(n-1)for n>2

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.