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Homework Statement
The following contour diagram represents the function z = f(x,y)
http://img15.imageshack.us/img15/9059/contour.th.jpg
(a) Is z an increasing or decreasing function of x?
I'd say it's increasing as it goes towards the x-axis the contour lines value goes down
(b) Is z an increasing or decreasing function of y?
I'd say it's decreasing as it goes towards the y-axis the contour lines value goes down
(c) Is fxx positive or negative?
I think it's negative
(d) Is fyy positive or negative?
I think it's negative
(e) Is grad f longer at point P or Q?
Q
Is my answer correct?
Homework Equations
The Attempt at a Solution
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