1-Redo Problem 12.21 by maximizing utility u = x05y0.3 subject to the budget constraint 10x +3y = 140. 2-Minimize a firm's total costs c = 45x + 90xy + 90y² when the firm has to meet a production quota g equal to 2r + 3y = 60 by (a) finding the critical values and (b) using the bordered Hessian to test the sccond-order conditions.

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