A firm's revenue function from the sale of S21 is R(x) = 2x² - 9x - 221 and the firm's total cost function is given by C(x) = -x² + 4 where x represents the level of demand for S21. i. How many S21 would the firm be required to produce and sell to record total revenue of zero? ii. [5 marks] Write an algebraic expression to represent the profit function for the firm. [3 marks] 2

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