Brazil is the most populous country in south america .in 2005 its population was about 186 million it was growing at a rate of 1.1%per year .Nigeria is th emost populous country in africa its population in 2005 was about 129 million it was growing at a rate of about 2.4%per year assuming that these growth rates continue , write function rules to predict the populations of these countrys for any number of years x in the future

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.