The monthly revenue R (in dollars) of a telephone polling service is related to the number x of completed responses by the function R(x) 11000 + 15/3æ? + 30x 0 < x < 1500 || If the number of completed responses is increasing at the rate of 10 forms per month, find the rate at which the monthly revenue is changing when x = 750. The monthly revenue is changing by $

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