(3) Find the relative maxima 0r minima. Indicate if the critical numbers give maximums 0r minimums. (a) Maximum of f(33, y) = 3333;, subject to a: + 23; = 32 (b) Maximum of f(33, y) = 513312, subject to a: + 23; = 15 (C) Minimum of f(l7, y) = 33:2 + 4y2 my 2, subject to 23: + y = 21 (4) Find positive numbers a: and 3; such that a: + y = 87 and 936312 is maximized