Compute the second partial derivatives ∂2f ∂x2 , ∂2f ∂x ∂y , ∂2f ∂y ∂x , ∂2f ∂y2 for the following function. f(x, y) = 2xy (x2 +
y2)2 , on the region where (x, y) ≠ (0, 0) Verify the following theorem in this case. If f(x, y) is of class C2 (is twice continuously differentiable), then the mixed partial derivatives are equal; that is, ∂2f ∂x ∂y = ∂2f ∂y ∂x .
I believe it would be 50 pounds. if one ream is 5 pounds, you would multiply that by however many reams you have. so if you have 10 you do 5 • 10 which gives you 50