Evaluate the following double integral: xy da d where the region d is the triangular region whose vertices are (0, 0), (0, 3), (3, 0).

Several paint mixtures are made by mixing blue paint and white paint. paint colors blue paint white paint mixture a 5 cups 12 cups mixture b 6 cups 6 cups mixture c 4 cups 12 cups mixture d 5 cups 6 cups which mixture has the highest ratio of blue paint to white paint