Question

1. Find a unit vector orthogonal to the vector < 0,3,1 > and < 2, 1,0 >.
2. Find the symmetric equation of the line through the point (π,7,11) and perpendicular to the plane 2x + 3z = 0.
3. Sketch the domain of the function
z=√9-y ln(x²-y)/x² +8