WeBWorK Standalone Renderer

Consider the shaded region in the graph below.

Graph of a triangle with vertices (0,9), (3,0) and (3,9), 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.