Question 1 A. The multivariable function fo, y) = 3::t.'2 + 23:34r .... 'Ir'yz + 13x .... 63! + 4-, find: 1- Ms 3!) 11- fetx, y) 10. mos) B. The prot and cost functions for the sale of college polo shirts are given by P( e) = awe3.1:-=1 + 7250 and c( e) = 42.1:2 53.e 4500 respectively. i. Derive the revenue function. it. Determine marginal revenue function. iii. Determine the marginal prot function. iv. Determine the marginal cost function v. Determine the marginal cost at Jr: 45