Please help me with these questions with an explanation!

2. Let f(x, y) = 16 -4x2 -y2. a) Compute fr(1, 2) and fy(1, 2), and interpret these values as slopes of tangent lines. b) Sketch the graph of f together with the tangent lines at issue. 3. The graph of a function f is shown. Determine the sign (+ or -) of the partial derivative at the indicated point. a) fx(P) b) fy ( P ) c) fx(Q) d) fy(Q) 04-9 Compute the first partial derivatives of the function. Simplify your answers where possible. 4. f(x, y) = 3x2 - 5x4y3 5. f(x, y) = arctan - 6. 2 = vx2-12 7. z = xIn(y*) 8. g(r, y, z) = x2 yeya= 9. W = Hint ow is easy-use the Constant Multiple Rule! Z