Point of Diminishing Returns In Exercises 53 and 54, find the point of diminishing returns for the function, where R is the revenue (in thousands of dollars) and x is the advertising cost (in thousands of dollars). Use a graphing utility to verify your result. 53. R = 1 1500(150x2 x3), 0 x 100

54. R = 2 3(x3 12x2 6), 0 x