Help Please!

1. f(x,y) = Vy-2+vx-9+ x Determine Domain and Range, express the answer using set builder notation and graphically. az and oz ax ax 2. yz = In(x + z) Compute for the following function lim x- + v2 (x, y) - (0,0) Vx +y' + 1-1 3. Compute 4. Determine the region at which the function is continuous. sin(xy) f ( x, y ) = if (x, y) = (0,0)] xy 1 if (x, y) = (0,0) 5. Compute express your answer using only independent variables dz oz oz z =x'+xy'; x=uv+w;y=u+ve" , and au av aw