1. The problem statement, all variables and given/known data Find ∂2f ∂x2 , ∂2f ∂y2 , ∂2f ∂x∂y , and ∂2f ∂y∂x . f(x, y) = 1,000 + 4x − 5y 2. Relevant equations 3. The attempt at a solution Made somewhat of an attempt at the first one and got 0, however my teacher has poorly covered this in class, and I would value some further explanation.