HW Q15I need help on my homework

The marginal revenue (in thousands of dollars) from the sale of x handheld gaming devices is given by the following function. R'(x) = 4x (x + 25,000) (a) Find the total revenue function if the revenue from 120 devices is $24, 166. (b) How many devices must be sold for a revenue of at least $50,000? (a) The total revenue function is R(x) =], given that the revenue from 120 devices is $24, 166. (Round to the nearest integer as needed.) devices must be sold to generate a revenue of at least $50,000. (Type a whole number.)