I need help i dont know how to do these

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.

1. how do you convert the repeating, nonterminating decimal 0. to a fraction? explain the process as you solve the problem.

Find the area of the region that is inside r=3cos(theta) and outside r=2-cos(theta). sketch the curves.