480 bottles because 300 divided by 5 is 60 so then you multiply 60 by 8 and you get 480!
The answer is A) left 3, up 2

has gradient

which at the point (-1, 4, 3) has a value of

I'm not sure what the given direction vector is supposed to be, but my best guess is that it's intended to say
, in which case we have

Then the derivative of
at (-1, 4, 3) in the direction of
is
