Note: please write down the Answer by hand on paper and also write each answer with the number of the questions

\f5. Use Lagrange Multiplier to find the largest and smallest values of the function f (x, y) = x2 +y. subject to the constraint x ty = 16. Compute the volume under the graph of f(x, y) = x2y on the region D in the second quadrant between the circles x2 + y2 = 4 and x2 + y2 = 9