Please help with the questions. Thankss!!

Problem 9. (1 point) Find the indicated partial derivatives of: _ _4xi3y f(x!}) _ 4X+3}' at the point (.r,_\\,-') = (l; l). a 051): a 331:1) = Problem 10. (1 point) Find the indicated partial derivatives of: Problem 11. (1 point) Find the indicated partial derivatives of: 5x Fm Problem 12. (1 point} Find the indicated partial derivative: 3 ,,. _ 8y y+4x _ Generated by @WeBWorK. httpwehwmkmaa org. Mathematical Association of Ametica Problem 13. (1 point) Find the indicated partial derivatives of: w = V 8:2 + 752 + 2:2. Problem 14. (1 point) Find the maximum and minimum values of the function f(x,_v, z) = xzvzzz subject to the constraint x2 + y2 + z2 = 196. Maximum value is , occuring at points (positive integer or \"innitely many"). Minimum value is , occuring at points (positive integer or \"innitely many"). Problem 15. (1 point) Find the minimum value of the function subject to the given con- straint. f(x:_v) = 12::2 + 5)? , 3x+ 5y 2 1 form : Problem 16. (1 point) Find the maximum and minimum values of the function f(x,_v,z) = y: + xy subject to the constraints )2 + z2 = 16 and xy = 8. Maximum value is Minimum value is