The 2000 census in a particular area gives us an age distribution that is approximately given (in millions) by the function f(x) =4o.1 + 2.13x- 0.792x2 where x varies from 0 to 9 decades. The population of a given age group can be found by integrating this function over the interval for that age group. E) a. Find the integral over the interval [0,9]. D (Round to the nearest integer as needed.)