answer me fast please ( all parts )

a) If a firm producing two goods Cloth(C) and Shoes (S) through optimal use of resources and face the profit function as fellow, IT = 640-202+4CS -452+325-14 Find the profit maximizing level of output of two goods Cloth and Shoes also test to be sure the profits are maximized and maximum profit. b) What is constrains optimization, explain and discuss the significance of langrage multiplier. c) Discusses the optimization of multivariate functions. Also explain the conditions for multivariate functions