For 41-44, Are the functions continuous? If not, describe the discontinuities. Be specific 41. fux) = + + x 42. f(x) = - X - 3 4x2 - 12x 43.) f(x) = x - 1, x20 44.) f(x) = x - 4, x50 (2x + 4, x > 0 In Exercises 45 and 46, find the constant a (Exercise 45) and the constants a and b (Exercise 46) such that the function is continuous on the entire real line. x52 45. f(x) = * > 2 flat line L