Year2000200220042006Number109141182233Year2008201020122014Number270296326355YearNumber2000109200214120041822006233YearNumber2008270201029620123262014355(a) Use the regression capabilities of a graphing utility to find a mathematical model of the formy=at2+bt+cy=at2+bt+c for the data. In the model, y represents the number of subscribers (in millions) and t represents the year, with t=0 corresponding to 2000. (b) Use a graphing utility to plot the data and graph the model. Compare the data with the model. (c) Use the model to predict the number of cell phone subscribers in the United States in the year 2024.