Question

Use the chain rule to find the indicated partial derivatives. Please do 18-21 thank you so much !!

17-21 Use the Chain Rule to find the indicated partial derivatives. 17. z = x4 + x2y, x = s + 21-11, y = stu"; az azaz as at' du when s = 4, t = 2, u = 1 , 2u + v when p = 2, q 1, r _ _ , ap aq ar _, _ when r = 2, θ = π/2 u = ye", w = e". aP aP ax ay 21, N = p + q when x 0, y = 2 ptr _, _, _ when u = 2, u 3, w 4