In Exercises 37–44, find the horizontal asymptote, if there is one, of the graph of each rational function. 12x 15x 37. f(x) 38. Ax): 3x + 1 3x + 1 12x2 15x 39. g(x) = 40. g(x) = 3x + 1 3x + 1 12r 15x 41. h(x) 42. h(x) 3x + 1 3x + 1 -2r + 1 -3x + 7 43. fх) 44. f(x) = 3x + 5 5x - 2

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