A sample of a radioactive isotope had an initial mass of 820 mg in the year 1995 and decays exponentially over time. A measurement in the year 2002 found that the
sample's mass had decayed to 380 mg. What would be the expected mass of the
sample in the year 2007, to the nearest whole number?

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.