(1 point) Suppose f(x, y) = x + y and D is the closed triangular region with vertices (4, 0), (0, 4), and (0, 4). Answer the following. 4x - 1. Find the absolute maximum of f(x, y) on the region D. Answer: 4 2. Find the absolute minimum of f(x, y) on the region D. Answer: -4 Find the maximum value of f(x, y) = xy for x, y > 0 on the unit circle. 6. fmax Find the minimum and maximum values of the function f(x,y, z) = 3x + 2y + 4z subject to the constraint x + 2y? + 6z = 1. %3| fmaz fmin