Hello, thank you for taking the time to post your question!
In order to solve this one you want multiply the dimension values together in order to get the total area.
For this question that means taking
5_1/3 feet x 9_9/20 feet
=16/3 feet x 189/20 feet
=3024/60 feet^2
=50.4 feet^2
So the ending area of the mural here would be 50.4 square feet.
I hope that helps get you moving in the right direction! Feel free to reach out if you have any additional questions beyond that :)