A contour map for the function f is showm below. Determine whether each of the following partial derivatives are positive or negative at the point P (with reasoning). K Hint 1: Remember, fr means "the...

Extracted text: A contour map for the function f is showm below. Determine whether each of the following partial derivatives are positive or negative at the point P (with reasoning). K Hint 1: Remember, fr means "the rate at which f is changing as x changes." (a) fm (b) fy (c) fræ (d) fyy - Hint 2: So..f¤z means "the rate at which fa is changing as x changes." 10 8 6