The electricity generated by wind turbines annually in kilowatt-hours/year is given in a file. Theamount of electricity is determined by, among other factors, the diameter of the turbine blade(in feet)

and the wind velocity in mph. The file stores on each line the blade diameter, windvelocity, and the approximate electricity generated for the year. For example, 55 406 5 10 3250 5 15 10970 5 20 26000 105 1625 10 10 13000 10 15 43875 10 20 104005 205 6500 20 10 52000 20 15 175500 20 20 41600 The U.S. census lists the population of the United States as 249 million in 1990, 282million in 2000, and 309 million in 2010. (Source U.S. Census Bureau) a) Fit a second-degree polynomial passing through these three points. b) Predict the population in 2020. c) Plot the graph