calculus 3 help, not sure if I posted in right place

Hi guys,

Like I said Im not sure If I posted this in the right spot, but if someone can take a look at these 3 problems and help me out I would appreciate it.

1.) Find ther extreme values of the function subject to the given constraint. F(x,y,z)= x^3 + y^3+z^3, x^2+y^2+z^2=4

2.)Write parametric equations for the tangent line to the curve of intersection of the surfaces. x+y^2+7z=9 amd x=1 at the point (1,1,1)

3.) A normal line tot he paraboloid z=6x^2 +2y^2 also passes thorugh the point (26,25,73). Find the point on the paraboloid that the normal line passes through.

any help would be greatly appreciated, this is a test review for our final exam and Ive got all the other material figured out, and have spent 3 days and a crap load of time and paper trying to solve these but am havin no luck.