Answer 13-20 please

In Exercises 11 and 12, use a graphing utility to graph the functions and to approximate (to two decimal places) any relative minimum or relative maximum values of the function. 11. f(x) = -x - 5.12 + 12 12. f(x ) = 15 - x + 2 In Exercises 13-15, (a) identify the parent function f, (b) describe the sequence of transformations from f to g, and (c) sketch the graph of g. 13. g(x) = -2(x - 5)3 + 3 14. g(x) = =x - 7 15. g(x) = 41-x| - 7 16. Use the functions f(x) = x2 and g(x) = v2 - x to find the specified function and its domain. (a) (f - g)( x) ( b) ( ) () () (f.8)(x) (d) (8 . f ) (x ) g In Exercises 17-19, determine whether the function has an inverse function, and if so, find the inverse function. Year, t Subscribers, S 17. f(x) = x3+8 18. f(x) = 1+ 6 19. f (x) 3x x 9 86.0 8 10 109.5 20. The table shows the numbers of cellular phone subscribers S (in millions) in the 11 128.4 United States from 1999 through 2004, where t represents the year, with 1 = 9 12 140.8 corresponding to 1999. Use the regression feature of a graphing utility to find a linear 13 158.7 model for the data. Use the model to find the year in which the number of subscribers 14 182.1 exceeded 200 million. (Source: Cellular Telecommunications & Internet Association) Table for 20