## Question

###### 20. The contour plot for f (xy) is shown at the right. Determine if each quantity is positive, negative, Or Zero_ (a) f (L,1) (b) f.(-11) (c) f,6-2,-2) (d) f,6-2,-2) (e) f,(1,1) (f) f.(,-1) where 1 = 1i Fj52-3 -3 52 -1 221. Let W(x;y) = 3xcos(ty)_ Find %w] and & if x=u +V and y=~ Tu k, 12) Tv k,12) dwl (b) Find if r=e and y= Int _ dt I=l

20. The contour plot for f (xy) is shown at the right. Determine if each quantity is positive, negative, Or Zero_ (a) f (L,1) (b) f.(-11) (c) f,6-2,-2) (d) f,6-2,-2) (e) f,(1,1) (f) f.(,-1) where 1 = 1i Fj 52 -3 -3 52 - 1 2 21. Let W(x;y) = 3xcos(ty)_ Find %w] and & if x=u +V and y=~ Tu k, 12) Tv k,12) dwl (b) Find if r=e and y= Int _ dt I=l

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