Let R Be the Rectangle Consisting of All Points (X $\iint _ { R } x y d y d x$

Short Answer

Let R be the rectangle consisting of all points (x, y) such that 0 ≤ x ≤ 3, 0 ≤ y ≤ 4.
Calculate $\iint _ { R } x y d y d x$ Enter just an integer.