Each problem is worth 0 points. It's a fake quiz, after all. Just learn from it.

1. If f(x,y) = , find an equation for the plane tangent to f at the point (0,3).
 
 

2. If g(x,y) = 3x - 2y + 6, find the directional derivative D_u g(-1,7) if u=<-3/5, 4/5>.
 
 

3. Find the gradient of z = sin x + sin y at the point (/2, 0).