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The concentration of salt in a fluid at (x,y,z) is given by F(x,y,z)=x^2+y^4+2x^2z^2 mg/cm3 You are at the point (1,1,1...

The concentration of salt in a fluid at (x,y,z) is given by F(x,y,z)=x^2+y^4+2x^2z^2 mg/cm3 You are at the point (1,1,1).
a. In which direction should you move if you want the concentration to increase the fastest?
I keep getting <5,2,8> for this answer and it says it is incorrect

You start to move in the direction you found in part (a) at a speed of 4 cm/sec. How fast is the concentration changing?
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