Provide an Appropriate Response $$\int _ { 0 } ^ { 2 } \int _ { 3 } ^ { 6 } \left( x ^ { 2 } + y \right) d x d y$$

Provide an appropriate response.
-True or false? Consider the double integral
$$\int _ { 0 } ^ { 2 } \int _ { 3 } ^ { 6 } \left( x ^ { 2 } + y \right) d x d y$$ The first step in calculating this integral involves holding x constant.