WeBWorK Standalone Renderer

Consider the shaded region in the graph below.

Graph of a trapezoid with vertices (1,0), (5,1), (5,4) and (1,4), with interior shaded light blue.

Write $\int_R f\,dA$ on this region as an iterated integral:
$\int_R f\,dA = \int_a^b\int_c^d f(x,y)\, d$ $d$ where
$a =$ ,
$b =$ ,
$c =$ , and
$d =$ .

You can earn partial credit on this problem.