Part A.)

(5 pts) Suppose z = f(x, y) is a differentiable function of r and y, where r = pq Ap of and y = . Use the table of values to calculate aq at (p, q) = (1, 2). fu (1, 2) -1 -1 3 (8, 2) 0 -2 1 (2, 2) 6 6 16