The surface area of a rectangular prism can be calculated by using this formula:
Where "w" is the width, "l" is the length and "h" is the height of the rectangular prism.
In this case, you can identify that:
![\begin{gathered} l=9\operatorname{cm} \\ w=4\operatorname{cm} \\ h=2\operatorname{cm} \end{gathered}]()
Then, substituting values into the formula and evaluating, you get:
![\begin{gathered} SA=2wl+2hl+2hw \\ SA=2(4\operatorname{cm})(9\operatorname{cm})+2(2\operatorname{cm})(9\operatorname{cm})+2(2\operatorname{cm})(4\operatorname{cm}) \\ \\ SA=124\operatorname{cm}^2 \end{gathered}]()
Therefore, the answer is:
![SA=124\operatorname{cm}^2]()