Answer:
The correct answer would be 28 units.
Explanation:
the length of the recktangle is 9. There are two sided with 9 so you would add 9+9. The height of the rectangle is 5 and there are two heights. You add 5+5 then you add 18 witch is the sum of 9+9 and you get 28.
I hope this helps.
Have a good day
<3 C.J