webwork typo

Hello Professor,
I am confused about the notation used to describe the gradient vector fields.

I see that there is a problem which has the function f(x,y,z)=4x+4y+2z and we are told to take the gradient of the function  <grad>f(x,y)=_i+_j+_k

The answer that was considered correct was based on a gradient which created a R^3 vector field.

Please help me understand, I don't know what I just did.

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I see what you are saying:  problem D has a function f(x,y,z) of three variables but <grad>f(x,y) has just two variables.  That's a typo in the code, and I think I fixed it. Reload the webwork and let me know if it changed.

BTW, thanks for getting started on this early.