If c ⊥ b and a || c, what is m∠2?

Ihave trouble finding the nth term of a linear sequence

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.

Iknow its nothing to do with education, but what type of thing should i wrote here? ? : ) its for mcdonald's btw.