a practise in reading between the lines

[virginia_bell]

One of the problems in today's multivariable calculus problem set:

The surface of Lake Erehwon can be represented by a region D in the xy-plane such that the lake's depth (in meters) at the point (x,y) can be given by the expression 400-3x2y2. If your calculus instructor is in the water at the point (1,-2), in which direction should she swim so

Comments

[zeft]

Now that's what I call an incentive!

[virginia_bell]

Mathematics should always be practical.

[virginia_bell]

Heh, it really hasn't got much to do with my being smart or not as I spend most of class blinking at the blackboard or silently screaming to myself, "I thought I would never see a physics problem ever again, so why is the word velocity written there?!" x)