1. The problem statement, all variables and given/known data Example 2: 2. Relevant equations Flux=integrate -Pgx-Qgy+R of the proj. area on xy plane for z=g(x,y) 3. The attempt at a solution Why do my attempt is wrong? The example is using the foundational formula while I use the stock formula from the book, why is there a negative sign difference between the answers? Or is that my formula used inappropiately? Thanks!