Calculate f(x, y, z) dS For Is f(x, y, z) ds = y=9-z², 0≤x, z≤ 8; f(x, y, z) = z

Find fx, fy, and fx. 23) f(x, y, A) = x²y + y² + x^²

28. f.(2, 4 ) if f(x, y) = x* In y |3|

Consider a function z = F(u(s, t), v(s, t)) where F, u, and u are differentiable and u(8, 6) = -1, v(8, 6) = 2, u, (8, 6) = 5, u, (8, 6) = 9, vs(8, 6) = −3, v₁(8, 6) = 4, Fu(-1,2) = -4, and F(-1,2)= -10. Compute and when s = 8 and t = 6 dt