The marginal revenue (in thousands of dollars) from the sale of x handheld gaming devices is given by the 3 R'(x) = 4x (x² +26,000) (a) Find the total revenue function if the revenue from 120 devices is $15,879. (b) How many devices must be sold for a revenue of at least $41,000? (a) The total revenue function is R(x)=, given that the revenue from 120 devices is $15,879. (Round to the nearest integer as needed.)

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