In Exercises 19 through 24, find the average value of the given function f(x) over the specified interval aExsb. 19. f(x) = 1 - x over -3 s x = 3 21. f(x) = e *(4 - e *) over -1 S x = 1 * - ex 23. f(x) = ette - x over 0 - x = In 3 In Exercises 25 through 28, find the average value V of the given function over the specified interval. In each case, sketch the graph of the function along with the rectangle whose base is the given interval and whose height is the average value V. 25. f(x) = 2x - x over 0 = x = 2 27. h(u) = over 2 S u = 4 u